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What if you funneled Niagara Falls through a straw?

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  • Published on Jul 14, 2025
  • Get a copy of What If? 2 and Randall’s other books at: xkcd.com/books
    More serious answers to absurd questions at: what-if.xkcd.com/
    This question comes from David, who asks: what would happen if one tried to funnel Niagara Falls through a straw?
    Credits
    *******
    Randall Munroe | Narrator
    Henry Reich | Writer & Director
    Lizah van der Aart | Illustration and Video Editing
    Ever Salazar | Chief Chaos Controller
    Know Art Studios | Music & Sound Effects
    What If? The Video Series is the official adaptation of the What If? books by Randall Munroe and is produced by Neptune Studios LLC.
    Randall Munroe is the author of the New York Times bestsellers What If? 2, How To, What If?, and Thing Explainer; the science question-and-answer blog What If?; and the popular web comic xkcd (xkcd.com). A former NASA roboticist, he left the agency in 2006 to draw comics on the internet full time.
    Henry Reich is the creator of MinutePhysics and executive producer of MinuteEarth and MinuteFood and founder of Neptune Studios LLC (the parent company for all three youtube channels).
    ©2025 xkcd, inc.
  • Science & TechnologyScience & Technology

Comments •

  • @rooryan
    @rooryan 27 days ago +9983

    Reducing the flow of the Niagara Falls by half when no one’s looking at it really makes it feel like a Disney attraction

    • @samgraffen9212
      @samgraffen9212 26 days ago +646

      Nothing in this world is safe from monetization.

    • @sophsolanumsamsys
      @sophsolanumsamsys 26 days ago +277

      ​@samgraffen9212 i think maintaining the falls at all is anti-monetization

    • @andersonklein3587
      @andersonklein3587 26 days ago +457

      @@sophsolanumsamsys until you remember all the businesses that rely on customers that come to see it, and all the home owners who benefit, and all the politicians who are lobbied to maintain it, etc. There is very little in this world that gets done at a loss for those who lobbied for it, and usually when it happens it is the most baffling of things, not the more noble or obvious ones.

    • @tom-ment-Capybara
      @tom-ment-Capybara 26 days ago +104

      and to imagine the niagra falls is only at a third of its natural output at the best of time's
      Maybe we should go back to leaving these things alone...

    • @bleistift2775
      @bleistift2775 26 days ago +417

      @tom-ment-Capybara Absolutely! Watching water fall down is way more important than generating electricity! We can always just burn more coal. It’s literally lying around.

  • @tauriusmagnamus3281
    @tauriusmagnamus3281 27 days ago +15941

    Every time XKCD says, "Let's ignore physics": "Welp there goes the planet."

    • @SecularZionist
      @SecularZionist 27 days ago +367

      Although hilarious, this actually also teaches us a very cool principle of physics- things are the way they are because otherwise destruction insues.
      Why?
      Well things in the world are pretty static from human perspective. But to change something in nature from its status quo we have to force it that way. No matter what, this artificial change is doomed to be destructive to nature, by definition- to break the laws of physics is to break the status quo, and to break the status quo is to destroy what we know and replace it with something we don't. Usually, we see that new thing as a bad thing, again by definition. However technically nothing really matters in terms of ethics, this is just how us humans react to things in nature going in unnatural ways.

    • @abraveastronaut
      @abraveastronaut 27 days ago +257

      I never really appreciated how hard physics works to protect us from other physics.

    • @TheEDFLegacy
      @TheEDFLegacy 27 days ago +78

      ​@@abraveastronaut It's a shame that idiots don't protect us from other idiots, like how physics protect us from physics. 😅

    • @Demmrir
      @Demmrir 27 days ago +33

      That's why everyone obeys the laws of physics. If you don't obey the law, planet goes FWOOSH.

    • @metachirality
      @metachirality 27 days ago +43

      ​@@abraveastronaut Well it's less like physics protects us from other physics and more that the only things that exist are the things that are lucky enough to have survived physics

  • @megapussi
    @megapussi 27 days ago +9846

    cant believe this didnt end with "one would be in very, very hot water"

    • @NeilCebara
      @NeilCebara 27 days ago +232

      I'll be back later, I'm going to take a relativistic bath.

    • @Ikxi
      @Ikxi 27 days ago +468

      It did end with "This is the last straw"

    • @walkieer
      @walkieer 27 days ago +59

      Won't even be water anymore.

    • @treywaka2444
      @treywaka2444 27 days ago +15

      Enjoy your reddit gold good sire 😂

    • @cheetahjab
      @cheetahjab 27 days ago

      Or somehow easily solved by the dutch... who then take over the world

  • @gdunn31
    @gdunn31 26 days ago +395

    My 7th grade science teacher one time flippantly said "you couldn't put the flow of Niagra Falls through this kitchen faucet" and I've been thinking about that weekly for the past 30 years. Can't believe XKCD of all places hammered this question directly on the noggin! I feel like a part of my brain can finally rest. Thank you!!

    • @toastmaster914
      @toastmaster914 13 days ago +31

      And the answer was, you can't. Not without violating the 1950 international treaty establishing the "100,000" cubic feet per second" minimum

    • @Huntswick
      @Huntswick 11 days ago +2

      so your teacher was correct, and you have wasted years thinking about something frivolous, you must work in a trade.

    • @philh2601
      @philh2601 10 days ago +34

      @@Huntswick and you must be insufferable to be around

  • @MrHater72
    @MrHater72 24 days ago +111

    I actually cannot put in to words the amount of thanks I could give you. You saying "Water always wants to boil, but is held down by air pressure" just clicked. I never really understood why water boils in a vacuum but that simple explanation just made it all click. Thank you so much. Great video as well.

    • @at1the1beginning
      @at1the1beginning 14 days ago +6

      Well, what is 'boiling'? It is evaporation WITHIN the fluid (and not just the surface).

  • @tomicblueberry
    @tomicblueberry 27 days ago +4843

    I mean, the number of committeemen angered is bigger than the number of planets destroyed. Let’s worry about the bigger number first.

    • @masonwhitehead7203
      @masonwhitehead7203 27 days ago +150

      That’s my favourite joke from the original version of this What If?

    • @SamForShort
      @SamForShort 27 days ago +78

      Hitchhiker's Guide the Galaxy ah statement

    • @planetoforts
      @planetoforts 27 days ago +30

      Hmm, this bar is bigger. We'll deal with it first

    • @LieseFury
      @LieseFury 27 days ago +7

      i laugh so i don't cry

    • @Ikxi
      @Ikxi 27 days ago +2

      @@SamForShort TRUE

  • @DanielKRui
    @DanielKRui 27 days ago +5812

    I had never realized/internalized 0:48 “water always wants to boil but is held together by air pressure”. Amazing, small change in perspective makes things like evaporation now obvious!

    • @asterpw
      @asterpw 27 days ago +43

      Or you could just freeze it. Ice exists in space.

    • @EvanOfTheDarkness
      @EvanOfTheDarkness 27 days ago +671

      @@asterpw Ice sublimates in space/vacuum. Water just _really_ _really_ wants to boil.

    • @planetoforts
      @planetoforts 27 days ago +219

      This is the reason for high altitude directions on recipes. The lower air pressure lowers the boiling point of the water some, meaning you need to compensate or you boil too much water in the cooking or baking process.

    • @OptimusWombat
      @OptimusWombat 27 days ago +13

      @@asterpw wouldn't it sublimate in direct sunlight?

    • @thenatron6136
      @thenatron6136 27 days ago +70

      @@asterpw Not at normal temperatures. There is a reason why there is no ice in space closer than the asteroid belt

  • @erikanvin9706
    @erikanvin9706 27 days ago +2039

    You forgot the "committee angered" vs. "worlds destroyed" graph from the book, that was so awesome!

    • @mattia_carciola
      @mattia_carciola 27 days ago +23

      Had to search for the blog post about it and we absolutey needed it hahaha

    • @_Siloam_
      @_Siloam_ 27 days ago +9

      @@mattia_carciola John 3:16 “For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.”
      Jesus loves you 😄🙏

    • @mattia_carciola
      @mattia_carciola 27 days ago +33

      ​@_Siloam_ kind of sure that if there's a god up there they're not really fond of me. Righteously, I must say.

    • @erikanvin9706
      @erikanvin9706 26 days ago +51

      ​@_Siloam_ I don't mean to be disrespectful, but how are god and Jesus involved with the original point?

    • @AlexofZippo
      @AlexofZippo 26 days ago +24

      @_Siloam_ begone, bot! also, really? pick a deep cut next time

  • @harklevidopsy7587
    @harklevidopsy7587 25 days ago +612

    1:28 To be fair, the whole of Niagara falls shooting out in a 10-meter across jet stream is already insane

    • @bhest...
      @bhest... 23 days ago +35

      17 trillion psi

    • @raynafae
      @raynafae 16 days ago +29

      i wanna drop stuff in the imaginary 10m radius jet stream and see what happens

    • @harrisjordan7492
      @harrisjordan7492 14 days ago +14

      ​@@raynafaeinstantaneous annihilation lol.

    • @Flarvik
      @Flarvik 12 days ago +1

      Sam?

    • @raynafae
      @raynafae 8 days ago

      @@Flarvik who?

  • @SyrusDrake
    @SyrusDrake 24 days ago +32

    "If you try to make water-which is pretty heavy-go that fast, it tends to start ignoring the turns in your pipes" has always been one of my favorite XKCD sentences and I was excited to hear it read out loud :'D

  • @Deeheeheee
    @Deeheeheee 27 days ago +2330

    You underestimate the power of those nice metal straws you can get

    • @pieceofschmidtgamer
      @pieceofschmidtgamer 27 days ago +74

      Niagara Falls: It's over straw! I have the high ground!

    • @TheoCrox
      @TheoCrox 27 days ago +86

      @@pieceofschmidtgamer Metal Straw: You underestimate my power!
      *proceeds to have the power output of a small star*

    • @Marcel-yu2fw
      @Marcel-yu2fw 27 days ago +33

      Do you want to see a magic Trick? I'm going to make this straw disappear...

    • @Deeheeheee
      @Deeheeheee 27 days ago +20

      @@Marcel-yu2fwI don’t want to know where it went.

    • @incognitoman3656
      @incognitoman3656 27 days ago +9

      What if it was just a REALLY big straw? Like Niagara size

  • @ObservableObserver
    @ObservableObserver 27 days ago +467

    The sentence: "water always 'wants' to boil, but is normally held together by air pressure" makes it sound like water has anger management issues, lol

    • @hanswoast7
      @hanswoast7 27 days ago +33

      It can get cold as ice and also burn your face off - if you are careless. It surely has anger issues.

    • @jlilley73
      @jlilley73 27 days ago +29

      I always want to boil, but I'm held together by peer pressure

    • @Spideredd
      @Spideredd 27 days ago

      Wait until you hear about salt water.
      It has anger management issues, hates everything and holds grudges.

    • @dicerson9976
      @dicerson9976 27 days ago +27

      The atmosphere is water's emotional support gas

    • @jama211
      @jama211 26 days ago +3

      @@dicerson9976hahaha that’s amazing

  • @tgypoi
    @tgypoi 27 days ago +581

    I really liked the joke from the print version where there's a graph showing 5 committees angered and 1 planet destroyed, so they say, "the first number is bigger, so it's probably more important."

  • @xStet
    @xStet 24 days ago +275

    3:24 without context is great

  • @room34
    @room34 13 days ago +8

    Things went totally off the rails after this of course, but the water ignoring curves in the pipe moment at 1:49 reminded me of the scene in _Indiana Jones and the Temple of Doom_ where the water is flowing so fast through the mining tunnels that it causes long strips of rock to blast out of the cliffside.

  • @Ilyena
    @Ilyena 27 days ago +3838

    I.. Did not expect this to end with "power output of a small star"

    • @Murmelthier
      @Murmelthier 27 days ago +58

      Same. It's wild.

    • @jedisalamander2457
      @jedisalamander2457 27 days ago +191

      You'd be surprised how often these do end that way

    • @gluttonousmaximus9048
      @gluttonousmaximus9048 27 days ago +84

      I DID expect that. Every single time.

    • @PizzaMineKing
      @PizzaMineKing 27 days ago +18

      That's not that much for a what if of this sort...

    • @planetoforts
      @planetoforts 27 days ago +24

      I was surprised when it was only one star. Normally stuff like this has more than that

  • @baker1320
    @baker1320 27 days ago +2541

    3:23 Given energy output projections, that may well be the actual last ever straw

    • @OtherTimeLoading
      @OtherTimeLoading 27 days ago +17

      Why didn’t they use that

    • @ChrispyNut
      @ChrispyNut 27 days ago +104

      It would be the straw that broke more than just the camel's back.

    • @Sch3m3r-a
      @Sch3m3r-a 27 days ago +56

      ​@@ChrispyNut
      "The straw that broke the Turtle's back"

    • @matan8074
      @matan8074 27 days ago +30

      ​@@ChrispyNutthe straw that broke the world.

    • @pinethetree
      @pinethetree 27 days ago +10

      Yeah, which would suck

  • @ENgriffinauthor
    @ENgriffinauthor 27 days ago +2618

    Earth Getting Destroyed: Collateral Damage
    Getting Sued by Multiple Organizations: WE CANNOT DO THIS

    • @MrBelguin
      @MrBelguin 27 days ago +123

      Reminds me of the Joker in an old Batman cartoon: "I'm crazy enough to take on the Batman - but the IRS? No-o-o thank you!"

    • @ProfessorHappens
      @ProfessorHappens 27 days ago +4

      😮

    • @IDSearcher
      @IDSearcher 27 days ago +23

      Average modern day corporation

    • @planetoforts
      @planetoforts 27 days ago +3

      This is Randell in a nutshell

    • @Skund79
      @Skund79 27 days ago +3

      This is almost a German behavior

  • @AlexRickabaugh
    @AlexRickabaugh 23 days ago +12

    When it comes to physics thought experiments, there are few opening sentences more exciting than "well, if you did that, it would have the power output of a small star".

  • @tankwallin1420
    @tankwallin1420 21 day ago +3

    one thing that i really like about XKCD is that he goes with the true answer of "well, it isn't possible, sorry" first, but doesn't stop there (like some). he goes on to ask "okay, but i want it to be possible, what if we just.. said it was possible, what then?"

  • @VechsDavion
    @VechsDavion 27 days ago +489

    Ah, of course. We all die. Again. I love that almost all of these "What if..." physics questions usually end with "... and we destroy the Earth via catastrophic energy release!"

    • @simenk3
      @simenk3 27 days ago +10

      Oh! What a delightful man to stumble upon, i recognized you in a heartbeat! Big fan of super hostile, good man 🍻🍻

  • @5thearth
    @5thearth 27 days ago +731

    Fun fact: Randall mentioned how most of Niagara's water goes to hydropower but a certain amount is legally mandated to go over the falls. In contrast, the world's tallest manmade waterfall (Marmore Falls) *is* in fact almost completely "turned off" most of the time and 100% diverted to hydropower, and only turned on for brief periods twice a day for people to watch. It's also more than 2000 years old--Marmore Falls was built by the Romans to drain a highland swamp, and no one in the following millenia has ever topped their feat.

    • @tulliusexmisc2191
      @tulliusexmisc2191 25 days ago +61

      According to Wikipedia, it was built in 271BC, which is remarkably early in Roman history for such a feat of engineering.

    • @evieb8412
      @evieb8412 25 days ago +87

      But apart from the sanitation, the medicine, education, wine, public order, irrigation, roads, the fresh water system, public health, and Marmore Falls, what have the Romans ever done for us?

    • @Eksistenssi
      @Eksistenssi 25 days ago +14

      @@evieb8412 thats bit too broad of a scope man... there were few relatively advanced civilizations before rome that did many of those. Sure rome improved on things but thats the same as saying that Josef Mengele gave us surgery and anesthesia

    • @MarsJenkar
      @MarsJenkar 25 days ago +32

      @@Eksistenssi You do realize that evie was referencing Monty Python's Life of Brian, right?

    • @punbug4721
      @punbug4721 24 days ago +18

      > no one in the following millenia has ever topped their feat.
      The Dutch would like a word.

  • @lankymaccrazyhair264
    @lankymaccrazyhair264 27 days ago +257

    I am amazed that not only something as innocuous as "forcing a large amount of water through a straw" is somehow *more* destructive than a lightspeed baseball turning into a nuke.

    • @j.vanderknaap9446
      @j.vanderknaap9446 27 days ago +28

      Ooh! Let's try that baseball directly opposed to the plasma spewing straw!

    • @isavenewspapers8890
      @isavenewspapers8890 27 days ago +19

      *Near* light speed. Crucial distinction.

    • @Validole
      @Validole 27 days ago +43

      Look at it this way. Yes, a baseball at 0.75c is really energetic compared to most things.
      But 100,000 cft of water has a huge head start in the mass part of the kinetic energy equation. And that's per second, not per event...

    • @lankymaccrazyhair264
      @lankymaccrazyhair264 27 days ago +4

      @@isavenewspapers8890 I mean, would sending it any faster than they did significantly alter the outcome? it's already a damn nuke.

    • @isavenewspapers8890
      @isavenewspapers8890 27 days ago +15

      @@lankymaccrazyhair264 Closer and closer to light speed, there's more and more energy, which increases without bound. You could destroy the planet if you wanted, or the galaxy, or worse. When the ball is *at* light speed, you break physics.

  • @xavierkibet4170
    @xavierkibet4170 26 days ago +173

    0:10 Reminds me of the people's front of Judea 😂😂

    • @NZSkutaBoi
      @NZSkutaBoi 26 days ago +1

      Same here! 😂😂

    • @jameseglavin4
      @jameseglavin4 26 days ago +19

      We’re the Judean People’s Front!!

    • @blobbedout
      @blobbedout 26 days ago +12

      Splitter!

    • @aaroneiler6276
      @aaroneiler6276 20 days ago +1

      You mean the Judean's peoples front

    • @SineN0mine3
      @SineN0mine3 17 days ago +1

      i thought it was the Judean People's Popular Front? or was it the Popular People's Front?

  • @LemuriaGames
    @LemuriaGames 26 days ago +2

    "it starts ignoring the bends in your pipes". Love that casually said sentence. With the accompanying illustration. 🙂

  • @janicechristinedenton0451
    @janicechristinedenton0451 27 days ago +571

    'Also the Earth would b destroyed'
    The deadpan delivery is perfect as ever

    • @kena4977
      @kena4977 27 days ago +16

      It wouldn't be an XKCD "What If" if it DIDN'T end in a nuclear explosion.

    • @stevenscott2136
      @stevenscott2136 27 days ago +2

      He says it so often that it's routine now.

    • @artsyscrub3226
      @artsyscrub3226 27 days ago

      ⁠@@stevenscott2136
      To be fair the earth is a fairly delicately balanced we are so far the only planet we've found that's like us, and we've explored pretty far out there, we've found "life" but at most it's bacteria, earth is pretty unique so i imagine the processes were very precise and very little changes effect everything from big to small

    • @WyvernYT
      @WyvernYT 27 days ago

      But what if we pointed the Water Jet of Relativistic Doom *up* away from the planet? Would we have to point it directly at the zenith to avoid precession effects? Could we get away with pointing it at the north celestial pole? Obviously we would want to avoid letting it intersect the moon, because that would be a different xkcd video.

    • @firepower7017
      @firepower7017 26 days ago

      ​@@artsyscrub3226delicately balanced? You talking about the once green ball of water which turned red because breathing is cool which ended anything that hated breathing. Or when it decided to become a microwave for a change while salting the ocean which managed to end the trilobite? Or maybe that one time it wanted to roleplay as a refrigerator.
      Seems kinda like torture.

  • @Marylandbrony
    @Marylandbrony 27 days ago +535

    "Hey Ferb, I know what we we're going to do today"

    • @jordansean18
      @jordansean18 27 days ago +22

      Literally every episode of this show lol

    • @ProfessorHappens
      @ProfessorHappens 27 days ago +4

      😮

    • @CosmicPlatonix
      @CosmicPlatonix 27 days ago

      "You see, Perry the Platypus, in my youth I was constantly tormented by local bullies using plastic straws as blowguns to shoot spitwads at me. Hence, my newest creation: The NoStrawsAnywhereInator!"

    • @WackoMcGoose
      @WackoMcGoose 27 days ago +2

      @@jordansean18 Followed immediately by "Hey, where's Perry?"

    • @SilverPhoenix020
      @SilverPhoenix020 27 days ago +10

      Candace: MOOOOM!!!! Fineas and ferb are gonna destroy the world...
      Dr. Doofincemertz? I can't spell:Behold my plasma straw pluginator...or something idk😂

  • @_digitalcoffee
    @_digitalcoffee 27 days ago +255

    Cavitation is no joke, it pits and chips boat props and the wrong prop and pitch can completely remove the blades.

    • @lougottlieb156
      @lougottlieb156 27 days ago +13

      Cavitation is bubbles of vacuum; when they collapse it's violent --- very violent. Not bubbles of steam.

    • @TheMalT75
      @TheMalT75 27 days ago +21

      @@lougottlieb156 There is no vacuum in water. There will always be water molecules within those bubbles. I agree that bubbles of water vapor is technically the more correct term because most people associate boiling temperatures with steam, which is room temperature at those low pressures...

    • @TheMalT75
      @TheMalT75 27 days ago +10

      Plus, pistol shrimps use it offensively to knock-out or around other creatures...

    • @tvuser9529
      @tvuser9529 27 days ago +6

      It keeps dentists employed, though.

    • @alexsiemers7898
      @alexsiemers7898 27 days ago +12

      The excessive noise can also let Reapers hear you.

  • @engineeringworld.
    @engineeringworld. 7 days ago

    Niagara Falls through a straw? Somewhere, a fluid dynamics professor just woke up in a cold sweat.

  • @KahranRamsus
    @KahranRamsus 19 days ago +4

    "Also, the earth would be destroyed." Yeah, like that's anything new here.

  • @chessedgamon
    @chessedgamon 27 days ago +1068

    don't worry guys I used a paper straw so the earth is safe

  • @felixw19
    @felixw19 27 days ago +670

    Sad you left out the "Speed in Quater c" table, as this is one of my favorite xkcd gags of all time.
    Water speed in 1/4 c Problems?
    0 maybe
    1 yes
    2 yes
    3 yes
    4 very yes
    5 please stop

    • @HyperBirbN3rd
      @HyperBirbN3rd 27 days ago +32

      I know, right? I was hoping for it to come up :(

    • @EridaniStar
      @EridaniStar 27 days ago +31

      That was probably among the best things in the second book in my opinion.

    • @marblemaster1
      @marblemaster1 27 days ago +68

      "I guess the water is going back in time? Maybe we should call a plumber."

    • @nekrugderzweite8298
      @nekrugderzweite8298 27 days ago +39

      i appreciate the alignment. very well done

    • @felixw19
      @felixw19 27 days ago +21

      ​@nekrugderzweite8298 thank you 😊
      It took a minute or two, but I'm happy with how it turned out

  • @SoupEarthOfficial
    @SoupEarthOfficial 27 days ago +809

    I would drink it because im kinda thirsty rn

  • @ShadowRegis
    @ShadowRegis 23 days ago +1

    Type of question that would make the whole class including teacher laugh at you but when starting to explain, it reveals a lot of mechanisms and variety of physic laws. It's so important to have proper people in the education field

  • @WhatIf_Revelations
    @WhatIf_Revelations 19 days ago +1

    This is exactly why I love What If scenarios! 🤯 You took a wild hypothetical question and turned it into a super fun mix of science experiments, physics facts, and even space-level energy. It felt like a brain workout but in the best way possible 😂 Subscribed!

  • @Oregonjoe90
    @Oregonjoe90 27 days ago +198

    I always love how after we render the earth uninhabitable it comes back to, oh and you will get a $200 ticket and a stern talking to

    • @HyperBirbN3rd
      @HyperBirbN3rd 27 days ago +9

      Obviously, the second part is more worrying. 😆

    • @abraveastronaut
      @abraveastronaut 27 days ago +3

      Hit by pitch...

    • @simongeard4824
      @simongeard4824 27 days ago +1

      Well, you know... destroying the world is bad and all, but nobody likes to deal with paperwork.

  • @haraldclark6206
    @haraldclark6206 27 days ago +47

    Love the "This is the last straw!" at the end!

  • @pusheenthecat9264
    @pusheenthecat9264 27 days ago +147

    So you're telling me Niagara Falls would become the ultimate water gun? Sounds like a good idea to me!

    • @lankymaccrazyhair264
      @lankymaccrazyhair264 27 days ago +14

      sure, if you wanted the ultimate water gun to be able to destroy planets.

    • @allyionsol3274
      @allyionsol3274 27 days ago +29

      @@lankymaccrazyhair264 That's what makes it the ultimate one!

    • @chengong388
      @chengong388 27 days ago +7

      Only after you’ve built the ultimate death ray to accelerate it

    • @jespervalgreen6461
      @jespervalgreen6461 27 days ago +3

      Or at least, an idea

    • @michaelburke4048
      @michaelburke4048 27 days ago +3

      ::Jots down some notes for our next interplanetary conflict.::

  • @5paulo
    @5paulo 22 days ago +3

    I can go sleep well at night knowing that the International Niagara Committee is standing between some mad scientist and destruction of the world.

  • @musamoyo8968
    @musamoyo8968 25 days ago +27

    2:49 But what if we had more power?

    • @irrelevant_noob
      @irrelevant_noob 22 days ago

      ... the straw might just disintegrate?

    • @AmphibiousGentleman
      @AmphibiousGentleman 21 day ago +4

      @irrelevant_noob It's a reference to a different What If, about what would happen if everybody on Earth pointed a laser pointer at the moon at the same time. The real answer is "not much", but one of the stick figure guys keeps asking "What if we tried more power?" So the power gets cranked up step by step until we get to "the moon would get partly vaporized and blasted out of orbit (except not really, because that would definitely fry the Earth and all the lasers first)."

    • @NovaBoi7
      @NovaBoi7 6 days ago

      oh god not again

  • @silverxsnake2149
    @silverxsnake2149 27 days ago +127

    I do NDT (Nondestructive Testing) inspection work on pipes in Nuclear plants, and cavitation is a HUGE issue
    but the fact water boils at a certain pressure is also very USEFUL, so when its expected, you can simply use a tougher (more expensive) steel, or atleast design it in such a way that the pipes can be replaced easily.
    There are two types of common wear that pipes receive on a nuclear plant. FAC and EPC
    Manual Erosion is called Erosion in Piping and Components (EPC). This describes Cavitation, as well as a unique phenomenon where the water flows so fast that jets of steam form within the water stream that hit the walls (instead of a vacuum being formed as described in cavitation) creating a wear pattern that is known as Tiger Striping. This commonly happens at pipe reducer or expander boundaries, as well as Elbows.
    Also, water chemically erodes pipes as well! This is called Flow Accelerated Corrosion (FAC) as the water flows, the molecules bond with the metals in pipes slowly eroding it over time. kind of like the worlds slowest acid. Suuuuuper fascinating stuff, I love my job so much.
    There is a Third type of wear a pipe can recieve that I do not remember the name of (Its fairly uncommon). I havent encountered it yet, but its basically colonies of bacteria that grow within the pipe and consume the steel itself over time in a chemical process. This typically happens in water intake manifolds and piping, and is surprisingly common on oil and gas refineries as well.

    • @nikolatasev4948
      @nikolatasev4948 27 days ago +4

      Super interesting, thanks!

    • @boobah5643
      @boobah5643 26 days ago

      FAC isn't _like_ the world's slowest acid. It _is_ acid. Hydronium Oxide is _the_ weakest acid and only really happens if you dump lots of energy into the water (heating it up and/or pumping it at speed;) at low energy levels the hydronium and oxide tend to settle down into a couple water molecules.
      Calling water 'the universal solvent' is only a slight exaggeration.

    • @Trixtah
      @Trixtah 25 days ago +6

      Huh, that second factor seems like it might explain why eathernware pipes can last for centuries. Sure, they are annoyingly brittle (and therefore have a big mass vs capacity), but if they don't get broken, they can last a very, very long time. Of course there are metals in earthenware, and basic friction obviously still exists, so nothing's immune to "water wear".

    • @jasonwalker9471
      @jasonwalker9471 24 days ago +5

      Thanks for sharing, loved that. It is super fascinating.
      Your description of 2 common events and a rare one reminded me of dialogue from an episode of Lower Decks that I enjoyed named "The Least Dangerous Game":
      "There are only three types of prey. You are the first type, immobilized by your fear. The second type scurries away to hide, delaying the inevitable."
      "Uh, what's the third kind?"
      "The third is a winged lizard-type creature, that doesn't really apply to you."

    • @tonyth9240
      @tonyth9240 21 day ago +2

      Water is indeed a really really weak acid, chemically. The pH of neutral water is at 7, but that still means it contains 10^-7 moles of H3O+ Ions, and these ions are what makes an acid an acid. It's also a really really weak base, that's basically the opposite effect.
      So yeah, it actually dissolves the pipe like an acid, because it is one. Really cool :)

  • @EchoFolf
    @EchoFolf 27 days ago +344

    "This is the last straw" 💀

    • @EEEEEEEE
      @EEEEEEEE 27 days ago

      ‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎E

    • @frank_sands
      @frank_sands 27 days ago

      came here to say this 🤣

    • @Placeholder-nc8yt
      @Placeholder-nc8yt 27 days ago +5

      literally

    • @bificommander7472
      @bificommander7472 27 days ago +3

      The straw to end all straws.

    • @Imincapableofbeingwrong
      @Imincapableofbeingwrong 27 days ago +1

      That bit had me in stitches.

  • @UnDesSchtroumpfs
    @UnDesSchtroumpfs 27 days ago +344

    Cubic feet per second over square millimeters is an interesting choice of units.

    • @dogcarman
      @dogcarman 27 days ago +49

      It turns into the power output of a small star so I guess it’s OK.

    • @TrystyKat
      @TrystyKat 27 days ago +5

      This made me pause as well :s

    • @robertjarman3703
      @robertjarman3703 27 days ago +16

      That is ((l*l*l)/t)/(l*l), which simplifies to length over time, which is speed.

    • @nathansos8480
      @nathansos8480 27 days ago +3

      @@robertjarman3703makes sense, although I guess it would be in 5 dimensions?

    • @nddragoon
      @nddragoon 27 days ago +6

      @@nathansos8480 no, 2 length units cancel out at the top and bottom, leaving only length over time

  • @S_Paoli
    @S_Paoli 24 days ago +2

    I have been using this video to help me fall asleep for the last two nights..... worked like a charm! sometimes I don't even make it past the first minute before I pass out.

  • @ZanZan_DK
    @ZanZan_DK 25 days ago +1

    My mood always brightens when I see there's a new 'What If?' video, because I know that I'm about to spend a couple of minute giggling over insane idea, and well thought out math.

  • @Andre-qo5ek
    @Andre-qo5ek 27 days ago +25

    the seriousness that is taken to answer these questions is beyond amazing. TY

    • @CaptHayfever
      @CaptHayfever 27 days ago +8

      That's the great thing about asking engineers weird questions: They wanna figure out the answer too!

  • @lombardo141
    @lombardo141 27 days ago +149

    OMG!!!! This 2:15 i was always wondering why during the winter when i visted Niagara when i lived in Buffalo it always flowed slower than in the summer. All this time i thought it was due to ice and stuff. Thank you, my 30-year wonderment has been solved. (sure, i could have looked this up, but who has time for that? )

    • @laureng2110
      @laureng2110 27 days ago +8

      I once visited a different famous waterfall during the off season, and yep, it looked pathetic! My fault for not checking beforehand.

    • @NotFunctional-ever
      @NotFunctional-ever 26 days ago +1

      ​@randomuser-xc2wr same thing that happened in the Nile happened in the Tigris and Euphrates in Iraq. Almost every river that held some importance would be molded by humans.

    • @mogyui2902
      @mogyui2902 12 days ago +1

      I lived there for a couple years. I had NO idea they TURNED THE FALLS OFF essentially

  • @KieranBorovac
    @KieranBorovac 27 days ago +257

    0:17 okay apologies for the pedantry but why is this explosion centred on northern Europe

    • @CoNteMpTone
      @CoNteMpTone 27 days ago +40

      Because thats the important part of the world where the USA is.

    • @PaulTomblin
      @PaulTomblin 27 days ago +72

      Because that’s where the Large Hadron Collider lives?

    • @JP_TaVeryMuch
      @JP_TaVeryMuch 27 days ago +2

      Beg par'n but I'd say more like Zankt Pieterborg.

    • @stevenscott2136
      @stevenscott2136 27 days ago +10

      The high-speed water plasma made it that far before superheating the atmosphere into the characteristic mushroom cloud.

    • @Cryptic_Boom
      @Cryptic_Boom 27 days ago +16

      Nah nah, your all wrong
      It’s just a really long straw

  • @zaynekopp3062
    @zaynekopp3062 26 days ago

    I genuinely, really enjoyed this video. was expecting a much lower bar of content from shorts and shit. I had forgotten how nice it is just to sit down and learn something.

  • @trevorbranch9547
    @trevorbranch9547 24 days ago +1

    All that just to make a "this is the last straw" joke? I love it.

  • @markmumm5029
    @markmumm5029 27 days ago +15

    One of the scenarios in one of the What If? books, Randall takes the prompt in the opposite direction as expected, calculating decreasingly destructive answers to the prompts and finishes the chapter with something like "sometimes it's nice to not destroy everything".
    Which means he's capable of taking the narrative in a direction where the Earth isn't destroyed every single time, yet chooses not to. I kinda respect that.

  • @mawnkey
    @mawnkey 27 days ago +195

    On a related note for anyone who's never heard of them: waterjet cutters exist and they're pretty neat. There's a couple channels here on RUclips that use them a lot cutting all kinds of things you wouldn't expect. No relativistic waterjet cutters though sadly.

    • @TheMalT75
      @TheMalT75 27 days ago +18

      "Let's combine an x-ray laser cutter with a waterjet cutter! What could go wrong?!?" Although iirc waterjet cutters typically add an abrasive like fine sand to it for better cutting performance and do reach the speed of sound in water which is about Mach 3 in air...

    • @iamepick1
      @iamepick1 27 days ago +2

      @@TheMalT75 yea but thats for metal and stuff, they cut easier stuff without an abrasive but rougher edge

    • @manderic5436
      @manderic5436 27 days ago +20

      At relativistic speeds, it would less a 'waterjet cutter' and more a 'ultra-high energy plasma cutter'.

    • @Haanicz
      @Haanicz 27 days ago +20

      @@TheMalT75 I think if you have waterjet that can reach 0,25 c, you're gonna do fine without the abrasive.

    • @q-tek8349
      @q-tek8349 27 days ago +8

      "sadly"
      yeah i think i'm okay with that

  • @Marconius6
    @Marconius6 27 days ago +63

    Bro just wanted to put a straw in water and accidentally created the Death Star...

  • @opentls
    @opentls 15 days ago

    "it tends to start ignoring the turns in your pipes" is such a funny way to put it

  • @Cokamo
    @Cokamo 13 days ago +1

    Cautiously picking up a straw "The power of the sun, finally, in the palm of my hand."

  • @Fhnsgkdfkvsgmvdg-y6u
    @Fhnsgkdfkvsgmvdg-y6u 27 days ago +57

    "ignoring the bends in your pipes," is a bit of an interesting phrase.

    • @fredericapanon207
      @fredericapanon207 26 days ago +1

      I have forgotten the name now, but there are engineering structures to resist the forces at the bends in pipes, especially municipal-size pipes for water and waste water.

    • @Jadefire1010
      @Jadefire1010 26 days ago +3

      It's basically another way of saying that it turns into a waterjet cutter.

  • @OrtyBortorty
    @OrtyBortorty 27 days ago +75

    Loving the sound design at 3:03 🐿️

  • @Wolfiyeethegranddukecerberus17

    I'm working on a series with a hydrokinetic character and now I have the perfect idea for a late stage power-up. Thanks Randall!

  • @TheAterron
    @TheAterron 23 days ago +2

    I like how, despite this being a serious discussion, it's comically funny how the niagara falls can potentially destroy the earth if the physics would allow it.

  • @Too_Tall_64
    @Too_Tall_64 15 days ago

    I do love the "What would happen?" question being answered with "A LOT OF AGENCIES WOULD BE SUPER MAD AT YOU ACTUALLY!"

  • @Hazy_Heart
    @Hazy_Heart 27 days ago +293

    2:19
    idk why but I laughed out loud at the idea of a waterfall being turned off at night
    (Even though this is just a waterfall being turned down, no off)

    • @Athenor
      @Athenor 27 days ago +35

      They do a lot of work on all 3 falls (Horseshoe, American, and Bridal Veil falls) to control things like erosion and flow rate.

    • @Grizabeebles
      @Grizabeebles 27 days ago +12

      Just think, after we hit peak oil and peak nuclear, there will be a strong financial incentive in the 23rd century to use 100% of the water for drinking and electricity.

    • @gavros9636
      @gavros9636 27 days ago +13

      At some point, the falls may be turned off completely for maintenance. (And to see what cool stuff they can find)

    • @glenm99
      @glenm99 27 days ago +31

      I used to run a set of hydroelectric generating stations, and some of them had no restrictions on river flow. To send water to the generating unit intakes, we'd turn on one particular river every morning before people started waking up, and then we'd turn it off when everyone was going to bed and we didn't need the additional power any more. I operated the valve in person once (as opposed to using the computer control), and it was spectacular.

    • @LordHead-Ass
      @LordHead-Ass 27 days ago

      ​@@gavros9636such as the endless amounts of corpses.

  • @UNgineering
    @UNgineering 27 days ago +60

    so many XKCD WHAT-IF stories end with "it would boil away the oceans and make the Earth uninhabitable"

    • @lancedicker858
      @lancedicker858 27 days ago +7

      Maybe because, like he said, water already *wants* to boil! 🤔

    • @IchBinPowerPaul
      @IchBinPowerPaul 27 days ago +5

      In this case, it even boils away the Earth and makes the oceans uninhabitable.

    • @boobah5643
      @boobah5643 26 days ago

      Well, when most of them come down to "If you tried, you'd add an absurd amount of energy to the planet" you don't really get to be surprised when the energy does energy things.

  • @SimonBuchanNz
    @SimonBuchanNz 27 days ago +12

    The instant i see the title: "ok how does this innocent question kill everyone on earth this time?"

  • @BeyerEfendi
    @BeyerEfendi 13 days ago

    "Apparently, our water will be going one quarter of the speed of light" is the most hilarious thing I've heard today.

  • @Emil-yd1ge
    @Emil-yd1ge 26 days ago +1

    It's so cool that even though the water is accelerated to the absolutely bonkers, unfathomable velocity of 0,25c, a small star is enugh to equal the power output. Space is so vast.

  • @esued86
    @esued86 27 days ago +8

    Can always rely on this channel to answer the questions I never knew needed to be asked

  • @mateuszmosciszko9762
    @mateuszmosciszko9762 27 days ago +92

    This will be very helpful for my Fluid Dynamics test tomorrow.

    • @SilverPidgeon833
      @SilverPidgeon833 27 days ago +8

      Good luck! I had an end of year science test this morning so I can relate.

    • @spacelag5104
      @spacelag5104 27 days ago +5

      I just had mine today, you got this, good luck!

    • @AndyZach
      @AndyZach 27 days ago +5

      I never took fluid dynamics as an undergrad. I haven't regretted it to this day.

    • @lumipakkanen3510
      @lumipakkanen3510 27 days ago +5

      Everything turns to plasma so Magnetohydrodynamics is more applicable here.

    • @jaelwyn
      @jaelwyn 27 days ago

      Man, if destroying the planet is better than sitting it😊, that is one *harsh* test...

  • @lopsidedpolygon
    @lopsidedpolygon 27 days ago +70

    new wacky scifi weapon tech just dropped
    dont mind me
    just gonna slot this here thang into my worldbuilding

    • @matj12
      @matj12 27 days ago +10

      There is already water jet cutting. This is that but more. Death Star water jet cutter.

    • @catastrophicox9353
      @catastrophicox9353 27 days ago +4

      Based

    • @ridhosamudro2199
      @ridhosamudro2199 27 days ago +9

      Watch out he's gonna piss on the moon!

    • @AndrewMeyer
      @AndrewMeyer 27 days ago +3

      World's most deadly Super soaker. 😂

  • @leexabyz
    @leexabyz 26 days ago

    I love how xkcd can take even the most mundane of topics and present it in such an amazingly entertaining way

  • @redish_tomato5833
    @redish_tomato5833 23 days ago +1

    "Would be greater than all light that fall on earth" sounds way harder than it's supposed to

  • @fendularatsq2317
    @fendularatsq2317 27 days ago +8

    "This is the last Straw !" genius 😆

  • @draxalore3078
    @draxalore3078 27 days ago +50

    3:00 If there was a way to do it. There would be a scientist willing to try. There is always one

    • @padre764
      @padre764 27 days ago +3

      I think a bigger problem is pumping the output of Niagara Falls across the Atlantic

    • @Tharkon
      @Tharkon 22 days ago +1

      @@padre764 While the LHC is the one depicted in the video, there are particle accelerators in the USA as well, they're just several orders of magnitude less powerful.

  • @thomasrinschler6783
    @thomasrinschler6783 27 days ago +26

    I've always wanted a What If? for "What would happen if Niagara Falls instantaneously eroded back to Lake Erie (presumably far enough in to reach an equivalent depth of the current falls if possible)?" Other than it being a bad day to be living in Toronto, I'm sure Randall could have a great time coming up with all sorts of interesting issues that would occur...

    • @myself248
      @myself248 27 days ago +1

      We get to build more Cleveland.

    • @TimChipp
      @TimChipp 27 days ago

      Think it would be bad for Toronto? Try living in Buffalo.

    • @thomasrinschler6783
      @thomasrinschler6783 27 days ago

      @@TimChipp Why? Most of Buffalo's waterfront is on Lake Erie, including downtown, and they would just see Lake Erie drain below them, like Cleveland would. Yeah, there would be some serious erosion along the new Niagara River canyon, but that would probably only affect at most a few blocks nearest the river (although I-190 would be toast in that area). And, given that the western branch of the Niagara River around Grand Island has the wider channel and the shorter route (and thus making it more likely the water would tend to flow that way), I'd be far more worried about the erosion that would happen across the river in Fort Eire ON rather than what happens in Buffalo. Meanwhile, Toronto would be facing massive and very quick flooding, probably inundating most if not all of the city.

  • @mikepatton8691
    @mikepatton8691 26 days ago

    I absolutely love these off the wall questions, the hilarious sincerity with which their first looked at, then the best part, the "let's ignore physics" part 😂

  • @JB2X-Z
    @JB2X-Z 25 days ago

    LMFAO "THIS IS THE LAST STRAW" is the perfect punchline to all of this.

  • @Shulker_Sensor
    @Shulker_Sensor 27 days ago +6

    The aliens in another galaxy wondering why a giant water jet is cutting their planet in half:

  • @Baphelon
    @Baphelon 27 days ago +4

    I love your approach to these is always "well here's the real answer... and here's the answer you're probably looking for"

  • @FlufLord
    @FlufLord 27 days ago +20

    I appreciate that, despite how many questions can be answered with “The Earth would explode”, they still take the time to explain how it could happen. 😊

    • @boobah5643
      @boobah5643 26 days ago

      It's not much of a video if you donn't bother to explain why.

    • @gogokowai
      @gogokowai 26 days ago +1

      I hope if anyone ever gets super powers they're an xkcd fan so they know better to not accidentally combust the atmosphere...

  • @Shrooblord
    @Shrooblord 7 days ago

    I love how almost every single one of these eventually results in "well then you get plasma" and then I know what time it is 😂

  • @SBNJTube
    @SBNJTube 25 days ago +1

    0:47 "water always wants to boil but is stopped by air pressure"
    Why have i never come across that before. It clears up so much. Absolute lightbulb moment.

  • @cerilious
    @cerilious 27 days ago +6

    I really appreciate the pun at the end.

  • @r.b.ratieta6111
    @r.b.ratieta6111 27 days ago +16

    The gigantic pipe labeled "Niagara Water" being slammed into the Large Hadron Collider "building" caught me off guard and made me laugh out loud. 😂 Thanks for that.

  • @uiohwqirrqewerfhguewifwj

    This is obviously the most effective way to make a hydroelectric dam.

  • @Average_Outhaul_User
    @Average_Outhaul_User 17 days ago

    "This is the last straw" killed me lol

  • @captain_red_beard4202

    "Apparently our water will be moving 1/4 the speed of light"
    That made me laugh out loud for some reason!
    😅😅😅😅😅

  • @RealGhoda
    @RealGhoda 27 days ago +4

    Cant believe the NIagra falls committee employees are strong enough to withstand the energy of a small star long enough to be angry about the 100,000 cfs law

  • @acidhelm
    @acidhelm 27 days ago +72

    So you're saying that doing this would cause a lot of
    (•_•)
    ( •_•)>⌐■-■
    (⌐■_■)
    splash damage.

  • @Zeequals
    @Zeequals 27 days ago +4

    I can’t believe you missed the opportunity at the end to say “in which case, one would be in very hot water”

  • @NoahBarin-r5b
    @NoahBarin-r5b 26 days ago

    I just have to say you, geniusly wrote that script had me entertained and educated the entire time

  • @onlyforcomments7760
    @onlyforcomments7760 25 days ago

    Ngl you sipping a drink casually at the end is hilarious

  • @dizzy_jump
    @dizzy_jump 27 days ago +4

    "THIS IS THE LAST STRAW!!" at the end killed me

  • @GrumpyTy34er
    @GrumpyTy34er 27 days ago +6

    I think all I'm learning is that I did not pay enough attention in my fluids class at college

  • @Optimore
    @Optimore 27 days ago +8

    It's not remotely scientific or even appropriate for polite company, but those interested should track down the website version of this question as it was originally inspired by an analogy made to the behavior of one's digestive system after consuming certain sugar-free gummies. The Amazon review that made this analogy is totally worth a read for the schadenfreude alone, though (as Randall originally stated) "It described the reviewer's gastrointestinal response to the candy in rather *memorable* detail".

    • @SupersuMC
      @SupersuMC 27 days ago

      I think the review got link-rotted, though.

    • @RichWoods23
      @RichWoods23 27 days ago

      Fortunately, we're not in polite company.

  • @Lightkie
    @Lightkie 23 days ago +3

    "This is the last straw!" The *very* last straw.

  • @Dubbadizzo86
    @Dubbadizzo86 23 days ago +1

    I just imagine the kid who sent this question is watching this video with his parents/siblings/friends and they're all roaring with laughter when his question turns from harmless to "everything becomes a plasma so infinite nukes blowing up the planet".

  • @bosnianseparatist1174
    @bosnianseparatist1174 27 days ago +5

    This is the sucking power of bro when he asks to get a sip of your drink

  • @ENgriffinauthor
    @ENgriffinauthor 27 days ago +16

    2:35 that's pretty fast.

  • @hrrld
    @hrrld 27 days ago +4

    Best one of these I've seen - what a delight.

  • @WHATIF...-2025
    @WHATIF...-2025 16 days ago

    That’s such a wild idea! 😲🌊 The thought of funneling all that water through a straw is both crazy and fascinating-imagine the pressure! I love how you break down these incredible scenarios in such an entertaining way. Looking forward to more mind-blowing videos like this! Keep it up!

  • @zammiorrs
    @zammiorrs 22 days ago

    this is exactly the content I expected when I saw the thumbnail and the title. good shit.