How to build a Cloud Chamber

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  • Опубликовано: 11 дек 2024

Комментарии • 271

  • @Gendo.
    @Gendo. 3 года назад +132

    This person seems born to educate. Something about the way she speaks, the enthusiasm is infectious! I wish I could of had a teacher like you in high school

  • @ВасилийЛесничий-с9и
    @ВасилийЛесничий-с9и 2 года назад +53

    I wonder why this amazing presenter is not mentioned somewhere in the credits or in the description. She is Sarah Charley, the US Communications Officer of CERN.

  • @marktime9235
    @marktime9235 5 лет назад +68

    I remember building one of these nearly 50 years ago in my shed, and being utterly amazed. As an amateur geologist I had access to some radioactive minerals which produced a tremendous display, despite not having access to dry ice. I manged to do it with a combination of just ice and salt!

    • @DubstepOverdose
      @DubstepOverdose 3 года назад +7

      What did you do exactly with the ice and salt?? Thx

    • @marktime9235
      @marktime9235 3 года назад +14

      @@DubstepOverdose So long ago, I can't remember exactly. BUt essentially, it was a tray of ice, liberally coated with salt and then covered with a layer of black foam soaked in isopropyl alcohol.

    • @DubstepOverdose
      @DubstepOverdose 3 года назад +7

      @@marktime9235 thx for taking the time to respond Anyways mate!

    • @rextransformation7418
      @rextransformation7418 Год назад +1

      ​@@marktime9235 very interesting, thank you!

  • @sophiereeves1042
    @sophiereeves1042 9 лет назад +214

    Wonderful experiment! I tried it and it worked for me without any radioactive sources or whatnot that provide more and a wider range of tracks. A few tips for those that are having trouble: dry ice can last for about 24 hours before it sublimates by every 5-10 pounds. Also, the purer the isopropyl alcohol( I used 99.9% off of Amazon), the more and brighter particles you will see. I also found that using a smaller fish tank and observing a more confined space works well. It also help if you use a strong flashlight ( mine was 250 lumens LED) and you point it directly inside the tank instead of leave it standing on the outside. Wonderful video! Thank you for sharing.

    • @BrassStacks
      @BrassStacks 8 лет назад +4

      Sophie Reeves , This might be a dumb question, but do you have to glue the felt to the tank? It seems like it would just flop to bottom when you turned it over if not.

    • @Otterbot97
      @Otterbot97 6 лет назад +11

      D Rock 75 I know this is a year late but me and some friends made one and we just used neodymium magnets to keep the felt up. It's also important to make sure the tank to metal interface is free of leaks (like REALLY airtight) otherwise the alcohol won't be supersaturated near the bottom. We used weather stripping and a thick aluminium block to prevent bowing from the cold.

  • @Verschlungen
    @Verschlungen 5 лет назад +12

    Perfect! Incredible how much you convey in just 4 minutes. Thanks to your video, I just relived the thrill of watching my mother's landlord do something similar for me when I was around 11 years old, in 1954. (Our landlord was Frank Crawford, a Berkeley Rad Lab physicist; he was a natural teacher with a Feynman-like enthusiasm who decided, on a whim, to build me a cloud chamber one day.)

    • @HHIto
      @HHIto Год назад

      In high school, I was a ’newbie' physics student, I was selected for a visit to tour the Lawrence Livermore Accelerator (Berkeley portion) and the Stanford Linear Accelerator, and much more... changed my life. My dad was a self-taught engineer who worked on many black projects (sr71). Young people, DO, read, listen, meet, visit, ... scientists are all over, many love to mentor, talk yo you if you’re humble, respectful and eager. That’s how I have had many unbelievable life experiences. You too, ok?

  • @markhaus
    @markhaus 3 года назад +14

    Cloud chamber experiments are one of those “aha” moments that really helps solidify intuitively how particles are constantly being emitted. That’s one of the great things about experiments, just learning theory and models doesn’t necessarily build an intuition, experiments do

    • @ssss-df5qz
      @ssss-df5qz 3 года назад

      Nothing better than the MK1 eyeball to understand something better.

  • @groseran
    @groseran 9 лет назад +38

    by far! the most amazing experiment I've ever seen (DIY category)!!!!

  • @cameraforchristmas
    @cameraforchristmas 10 месяцев назад +1

    Great video! I have made my own. I cobbled together several of the old instructions available 25 years ago. My chamber is glass, connected by stained glass foiled joints. Aluminum plate bottom, painted black, check. Thickish art paper around 3 sides for alcohol wicking, white to reflect back light. The light source is a classroom film projector, 300W. Surrounding base is similar with some foam insulation glued in.
    I think I want to remake it. I want to make a bank of LEDs to replace my awkward projector. I think, I will forego the surrounding white paper. I think a ring of felt near the ceiling (like crown molding?) will provide incoming warm alcohol vapor, without blocking the straight-down viewing perspective. The initial charge of alcohol is plenty, no wicking is really necessary. The viewing session only goes on for an hour or so before the viewers have become saturated with seeing cloud trails. Saturated - that’s cloud chamber humor.

  • @ZeroSpawn
    @ZeroSpawn 4 года назад +58

    That ending killed me! xD

  • @redryder3721
    @redryder3721 5 лет назад +14

    This is a very good quality demonstration. I followed this design as closely as possible, using a cardboard base, an upturned fish tank, black aluminium plate, dry ice, 99.9% isopropyl and masking tape to reduce draughts. It worked like a charm! My biggest issue was the quality of my camera which took very poor videos in the low light conditions. Remember the base needs to be as level as possible and the aluminium should be in contact with the dry ice.
    Try to get a torch with a narrow beam and manually point it in from the side. I wouldn't recommend LED strips because they create diffuse light which ruins the effect. You need to be able to adjust the position and angle of the light until you're satisfied.

  • @powertube5671
    @powertube5671 Год назад

    Thank you very much for posting this. I saw this on TV some time in the 50s and had no idea how to put one together.

  • @megabigblur
    @megabigblur 2 года назад +1

    This is amazing, I read about cloud chambers in school but had no idea you could make them with easily accessible materials. I thought you'd need some super high tech setup.

  • @KMac329
    @KMac329 5 лет назад +9

    This is fascinating and so easy to construct. She's inspired me to do it. I've assembled all the components except the dry ice and the bin for the dry ice. I'm looking forward to this! I'll let you know how it goes. It would be cool to make a video of it as well.

    • @samuelavraham4909
      @samuelavraham4909 3 года назад +5

      Well, how did it go? Still waiting for the conclusion!

    • @Zhizhuzye
      @Zhizhuzye 2 года назад +1

      Yeah how did it go? Mine doesn't working

  • @mike0rr
    @mike0rr 8 лет назад +10

    This is one of the better cloud chamber vidoes I have found, thanks.
    I would love to try this and put some slightly radioactive materials in and watch. I've seen some welding rods with some heavy metals in them produce a cool little show.

  • @sidgewickarsene
    @sidgewickarsene 10 лет назад +9

    this kind of physics stuff always reminds me of the Golden Compas book series. so mysterious. amazing. nature is amazing.

  • @terranrepublic7023
    @terranrepublic7023 2 года назад +3

    So this is what Jan does when she is not making candles, truly a versatile and talented lady

  • @TheRealFaceyNeck
    @TheRealFaceyNeck 9 лет назад +1

    @US LHC Thank you so much for this video!
    I don't want to re-create this myself, as I am impressively broke, and without much space to do it.
    ...also your explanations for how the different particles effect the vapor differently... wow. Just amazing. Thank you so much!

  • @RoySATX
    @RoySATX 3 года назад +21

    Okay, I'm amazed. I'm fifty-six years old so when I was a kid they still sold chemistry sets for children with the good stuff you could easily blow up your house or kill your annoying sister with (I did neither, thankfully), but none of that seemed as cool as this cloud chamber. You are never too old to learn something new.

  • @rickshaw3092
    @rickshaw3092 2 года назад

    Really excellent presentation! Clear, concise and easily followed instructions. Impressive.

  • @JonHunter80
    @JonHunter80 7 лет назад +30

    my hat goes off to all who thought of this.. just amazing to say the least.

    • @petertwiss356
      @petertwiss356 4 года назад +1

      man I thought these pictures were some crazy instrument, I always wondered how they documented particles smaller than protons/neutrons. I gotta go make this.

    • @anonymousstout4759
      @anonymousstout4759 3 года назад

      Is there any other easy to do experiment but also mind blowing like this? I mean something that is more than just volcano lava type of stuff?

    • @DetectiveWraith
      @DetectiveWraith 3 года назад

      @@anonymousstout4759 well, if you add baking soda to vinegar…

  • @johnnie135
    @johnnie135 6 лет назад +2

    One of my favorite videos on RUclips. Love everything about this experiment and the presenter. Nailed it!
    👽👽👽👽👽

  • @katmcmid1341
    @katmcmid1341 5 лет назад

    Yes! I use to do a very similar activity when i was working in a science centre in the UK. Really great to see other enthusiastic presenters, thanks a million! :)

  • @Ace0077
    @Ace0077 9 лет назад +1

    Well.... this is something new to me. And I've been digging around scientific stuff for a while now. Excellent idea! I'm wondering who came up with it.

  • @vickhenriquez9731
    @vickhenriquez9731 3 года назад +1

    I did not know it was this easy to make a cloud chamber!!

  • @mattmccroskey1826
    @mattmccroskey1826 9 лет назад +2

    Hell Yeah! That was actually a really incredible demonstration.

  • @RovingPunster
    @RovingPunster 6 лет назад

    The homemade cloud chamber footage at 3:34 is very cool ... I didnt realize it was as simple as dry ice and rubbing alcohol.

  • @Gajindrasahu
    @Gajindrasahu 2 года назад +1

    It felt like she was right next to me showing me a magic ! Great video 👍

  • @melm4251
    @melm4251 2 года назад

    i luff her. got me so keen to make my own cloud chamber! i even live near an industrial estate so i should be able to get some dry ice without much hassle

  • @satwadude3371
    @satwadude3371 7 лет назад

    Best explanation and demonstration I have seen yet. Thanks.

    • @mikejohnson4723
      @mikejohnson4723 5 лет назад

      ruclips.net/video/k_wt5AFjRQo/видео.html

  • @markptak5269
    @markptak5269 9 лет назад

    You do a FANTASTIC job. Way cool experiment as well.

  • @MakerFabio
    @MakerFabio 3 года назад

    You are so cool. Thanks for sharing this interesting experiment

  • @pianoslayer2516
    @pianoslayer2516 5 лет назад +3

    In this version of the experiment, you used isopropyl alcohol. I've read that either water or alcohol can be used. I figure that the compound must be polar so that its molecules are attracted to the ionization trails left by the cosmic rays. Are there any other compounds that can or have been used for this experiment?

  • @beautifulsmall
    @beautifulsmall 6 лет назад

    They had a cloud chambre at WOMAD this year. Amazing.

  • @BroEfeS
    @BroEfeS 5 лет назад +7

    1:04

  • @omernuhoglu
    @omernuhoglu 9 лет назад +3

    I've been doing a research about cloud chambers, and decided to do a school project about it, our teacher accepted it, but I need to show the deflection of particles (alpha particles) in magnetic field. I want to use the alpha emitting Americium 241 (taken from a smoke detector), and set a magnetic device (or just a magnet) around the cloud chamber to make the deflection visible, but how strong must the magnets be, in order to clearly deflect them, will a neodym magnet be sufficient enough? Alpha particles are bare helium nuclei, with two times the electrical charge than the electrons, so I suppose using them should be twice as much efficient than using a beta emitter.

    • @Sid-uc5ms
      @Sid-uc5ms 5 лет назад

      Neodymium is perfect. Go for it bro.

    • @mindtreat
      @mindtreat 5 лет назад +1

      How did it go?

  • @alphabetagamma4142
    @alphabetagamma4142 3 года назад

    This still fascinates me every time. 🙂

  • @AntonioAstorino
    @AntonioAstorino 10 лет назад

    That's cool! Cooler than the dry ice!!

  • @HermannCortez
    @HermannCortez 4 месяца назад

    Thats cool! Im soooooo building one of these for the kids!

  • @BigParadox
    @BigParadox 3 года назад

    Very cool....d! But seriously, big thanks for a very inspiring video!
    A question: I know that charged particles deflect in magnetic fields. Could one study this too here, by installing some strong magnets over the cloud?

  • @ecdavek230
    @ecdavek230 5 лет назад

    Well that was very kewl ( No pun intended ) .. Based on your vid of results , the trails in your cloud chamber seem much more interesting than other DYI . I'll assume the reason for that is the extra large volume of the chamber ... Nice. Very Nice ! Thanks .

  • @stargenemolly
    @stargenemolly 5 лет назад

    Notice that the larger more energetic tracks in these vids often appear
    almost instantly, not as lines, but as straight ribbons, oriented with their
    flat sides facing sideways. Then, in many cases, the top part of the
    ‘ribbon’ track travels upward a bit, while the bottom descends. I’m
    guessing that some of the high energy deposited into the alcohol
    vapor heats some of it up so that it travels up a bit and then cools
    off and descends with the lower part, dividing up into turbulent
    swirls. I've seen this again and again at public observatory exhibits.

  • @WhySeeF
    @WhySeeF 3 года назад

    Thank you for sharing this!!! Now I feel like shouting the last phrase she said in the end xD

  • @nathanstahlwirth4823
    @nathanstahlwirth4823 Месяц назад

    She's brilliant and lovely. Wow.

  • @seralvplyr
    @seralvplyr Год назад +1

    What if there is was a house of concrete and led/lead foil, will they still be able to pasS? Is it possible to considerably reduce the cosmic radiation? Did someone measured that?

    • @davidiverson2391
      @davidiverson2391 8 месяцев назад

      My classroom is in the center of a large concrete building. I can still see alphas, betas and muons.

  • @osmmanipadmehum
    @osmmanipadmehum 3 года назад +1

    can you build it as a machine so you wont need to add dry ice and soak it with alcohol all the time?

  • @PuiuM3u
    @PuiuM3u Год назад

    Who is she ? Is the best teacher

  • @swatpup6433
    @swatpup6433 2 года назад

    Just one question thou.. is the cloud trail video taken from the actual cloud chamber built in this video? I tot I saw the horizontal wires that is used in most professional cloud chambers to create a high voltage electric field?

  • @blakevk
    @blakevk Год назад

    That’s super! But how much does a big chunk of dry ice cost?$50-$60??

    • @MrLoliandthebear
      @MrLoliandthebear 8 месяцев назад

      I've seen it at grocery stores for that size for $0.99

  • @parkgators
    @parkgators 3 года назад

    Thank you for this, this is awesome!

  • @BradSchmor
    @BradSchmor 5 лет назад

    I really enjoyed this and want to do it now.

  • @zack_120
    @zack_120 3 года назад

    Reeeealy COOOOOL experiment, lovely.

  • @0991ekul
    @0991ekul 10 лет назад

    favourite video, check. so going to try this one day. thankyou for the video!

  • @alexanderx33
    @alexanderx33 2 года назад

    Does the tank have to be plastic so it doen't break from the cold?

  • @jbum
    @jbum 10 лет назад +1

    This is really cool. I'm curious what the typical shelf life of a cloud chamber built this way is? For example, how long before I need to replace the alcohol and/or dry ice? Follow up question: Assuming this doesn't last very long, what can I do to make a more permanent one, like the ones I've seen in science museums?

    • @USLHCatCERN
      @USLHCatCERN  10 лет назад +8

      Hi Jim. There are ways to make exhibit-quality cloud chambers that continually run (CERN's S'Cool lab has one) but they are much more expensive. They require a refrigeration unit (to replace the dry ice) and a system to circulate/replenish the alcohol. The kits for these exhibit cloud chambers are ~$10,000 I believe.

  • @robertgraham399
    @robertgraham399 2 года назад

    What would you see if you used a black light source - anything different?

  • @iñakias
    @iñakias 9 лет назад

    That's simply amazing. Thanks!

  • @hunzilah
    @hunzilah 3 года назад

    hey that was a nice explanation good job

  • @andyaim4764
    @andyaim4764 6 лет назад +7

    It's nearer to millions of particles per second hitting us from above...

  • @Summa-Bona
    @Summa-Bona 3 года назад

    So I’m sure these questions come up multiple times but I have to ask if the streaks I have a lance then does it mean that the particles pop in and out of our local space because it’s not going from end to end of the container please help

  • @hitanshshah8123
    @hitanshshah8123 6 лет назад +1

    Can we use distilled water instead of isopropyl alcohol and study the clouds?

    • @sigmasquadleader
      @sigmasquadleader 3 года назад

      @@anotherone4669 That's just plain false. The water solution just needs to be super-saturated in the air in the chamber. It's more difficult to do with water because water has a higher heat capacity and vapor point than various alcohols, so you'd need a higher "room" temp and still a very cold or colder condensation surface.

  • @blueridgedsia
    @blueridgedsia 3 года назад

    if you pour the excess alcohol on the dry ice wont it make the ice even colder?

  • @jonni2734
    @jonni2734 4 года назад +1

    AWESOME!!! Thank you!!!

  • @cakemix007
    @cakemix007 5 лет назад

    Wow! I must do this. I will. Are these cosmic rays? Or are some of them? How many? I assume the radon is emitted from the earth....

  • @mariechantalveytia6404
    @mariechantalveytia6404 5 лет назад

    which container should I use to put the dry ice in I'm not sure all materials can handle the dry ice

  • @kelvinanghanwei7516
    @kelvinanghanwei7516 8 лет назад

    I have a questions,is it possible to replace the felt cloth with any other cloth or fabrics material

  • @peterjames2004
    @peterjames2004 10 дней назад

    so if you were to go out with this and stand under an aurora would the chamber go nuts

  • @TofranBohk
    @TofranBohk Год назад

    Imagine if you could put on a pair of glasses and see all of the stray particles whizzing about?

  • @alanmaynard4647
    @alanmaynard4647 5 лет назад

    thank you soooooo much you have made my life so much easier.God bless you :)

  • @gilbertomendozaquintanilla1698
    @gilbertomendozaquintanilla1698 2 года назад

    How long does it take to see the effect?

  • @TanzanianRoots
    @TanzanianRoots 5 лет назад +2

    I'm so building this! I want to figure out a wait to make it sustainable indefinitly, like a desk ornament I can watch when I'm bored. Any ideas?

    • @ignasanchezl
      @ignasanchezl 5 лет назад

      Maybe you will need a phase change cooler to keep the bottom cool instead of using dry ice.
      And some kind of heatsink up top to keep it at room temperature.
      It's an engineering proyect for sure.
      if not a fridge, or an air conditione would require some soldering, maybe a phase change cooler (the ones for computer extreme overclocking) could be a simple way to keep a plate cool.
      Anyways it will be expensive and kinda loud.

    • @TanzanianRoots
      @TanzanianRoots 5 лет назад

      @@ignasanchezl I was reading about a "peltier' device for the bottom and a reversed one for the top. But dont know if they can get cold enough. THese ar the things that cool the plug in picnic coolers with 12v car socket.

    • @ignasanchezl
      @ignasanchezl 5 лет назад

      I doubt it, they are barely capable of cooling one or two drinks, and you need dry Ice levels here.
      If not you could just perform this with normal ice.

    • @whatsgoingtobreaknext-diy2981
      @whatsgoingtobreaknext-diy2981 5 лет назад

      @@ignasanchezl Search peltier cloud chamber. It can be done fairly easy. Though it may not be desktop toy sized.

  • @pavlabednarova5818
    @pavlabednarova5818 9 лет назад +1

    Hi everyone, I was wondering what material is the lid from? Any ideas? :) thanks

    • @AXes89
      @AXes89 9 лет назад +1

      +Pavla Bednářová Seems to be aluminium (anodized probably) from the sound it made. Any sheet metal should work great, maybe add a coat of black paint to make the trails more visible.

  • @cesarcamacho8072
    @cesarcamacho8072 3 года назад

    What is meant by supersaturation ?

  • @ezeee7303
    @ezeee7303 21 день назад

    will those clouds and deflections be visible to naked eyes??

  • @aminakhalid2197
    @aminakhalid2197 3 года назад

    You're doing great👏👏👏💯👌👍

  • @Aaron-zf4gk
    @Aaron-zf4gk 5 лет назад +2

    What's her name?

  • @nowi9776
    @nowi9776 2 года назад

    Where can I get dry ice?

  • @iEli97
    @iEli97 2 месяца назад

    does it work with liquid nitrogen or liquid air? (because iirc it's easier to obtain)

  • @notadeity
    @notadeity 9 лет назад

    Awesome video!

  • @mrmagnetic8993
    @mrmagnetic8993 7 лет назад

    can you analyse these particles after deposition?

  • @pashmaster
    @pashmaster 5 лет назад

    Could the dry ice be replaced with some serious Peltier elements, any idea what the temperature needs to be?

    • @randyhavener1851
      @randyhavener1851 5 лет назад

      Yes There are projects using two Peltiers or a combo Peltier for cooling. I think it gets down to -30, but I could be wrong on that number.

    • @anullhandle
      @anullhandle 3 года назад +1

      @@randyhavener1851 If you are going to stack them to get a higher temperature differential run one at its rated voltage and the other at roughly half that. The 5 12 volt supplies from an old pc supply are good. Alternatively stack a small one on top of a large one so it can dump its heat into the larger one and get colder.

    • @randyhavener1851
      @randyhavener1851 3 года назад

      @@anullhandle Thanks!!!

  • @drunkenblaster
    @drunkenblaster 3 года назад +1

    Why should the plate be black?

  • @adolfocamara
    @adolfocamara 9 лет назад

    Great video, thanks!

  • @Candy-dv2vz
    @Candy-dv2vz Год назад

    How does one obtain dry ice?

  • @kylelindberg7771
    @kylelindberg7771 3 года назад

    where do you put a radioactive source? directly inside the tank?

    • @Trev0r98
      @Trev0r98 3 года назад

      The "radioactive source" is the universe itself. That's all you need. That's the whole point of this experiment. This gadget is detecting the background radiation - particles - all around us, that is given off by the universe, galaxies, stars, and radioactive elements in the earth itself. All these particles are zipping through us all the time, and we're not even aware of it. The actual particle tracks you can see with this cloud chamber are made by alpha particles (bound protons and neutrons), beta particles (electrons and positrons), muons and cosmic rays (high energy protons and atomic nuclei).

    • @kylelindberg7771
      @kylelindberg7771 3 года назад

      @@Trev0r98 But if i stuck a chunk of Uranium in there, something might happen. I was just wondering where in the chamber to put it.

  • @thescarymoosh
    @thescarymoosh 10 лет назад

    Would this work with ethanol?

  • @nenoaf3104
    @nenoaf3104 10 лет назад +6

    Science!!!!!!!!!!!

  • @ignasanchezl
    @ignasanchezl 5 лет назад

    Wow I want to do this!

  • @vikaskaushik1729
    @vikaskaushik1729 6 лет назад

    What is the metal you have used to make the lid ?

  • @SovetskiDuck
    @SovetskiDuck 4 года назад +1

    Lucky if you in US, anywhere else you have to contact chemical companys and buy drice ice in bulk, like 10, 50, 100kg

  • @josephshaff5194
    @josephshaff5194 6 лет назад

    Was the lid metal or plastic ?

    • @MarcWhitaker
      @MarcWhitaker 5 лет назад

      Plastic and dry ice don't work well together. Plastic would get so cold it would crack, even shatter. Definitely has to be metal.

  • @nikildory5647
    @nikildory5647 4 года назад

    😂😂😂👍🏾 nice ... did u tried scare us with woooohh

  • @melissadouglas570
    @melissadouglas570 3 года назад

    Why do the particles seem to appear in a ‘flashing’ pattern, rather than some irregular way?

    • @Zhizhuzye
      @Zhizhuzye 2 года назад

      There's actually so many pattern based on the properties of particles, for example the straight pattern means that's muon

  • @lizsmith247
    @lizsmith247 5 лет назад

    Does anyone know if there's a specific kind of base you can order or is a miscellaneous base enough ?

    • @MarcWhitaker
      @MarcWhitaker 5 лет назад

      Your base should be dark and it should be metal. You want to transfer the cold to the bottom of the vapor-filled chamber as efficiently as possible. The base needs to extend past the edges of the vapor-filled chamber so the sublimating CO2 doesn't fill the chamber and push out the alcohol vapor.

  • @joejee01
    @joejee01 9 лет назад +5

    "science is coooll"
    haha:)

  • @dylxnchn
    @dylxnchn 7 лет назад

    if you don't have dry ice what do you do?

  • @deaftodd
    @deaftodd 2 года назад

    So that explains why I get drunk.

  • @JEIWILBER
    @JEIWILBER 3 года назад

    Thats is fantastic...

  • @antonsidko2993
    @antonsidko2993 10 лет назад

    Well... you are inspirate me...I going to assemble one!))

  • @sikhswim
    @sikhswim 3 года назад

    Holy shit this is amazing

  • @nidhin42069
    @nidhin42069 3 года назад +2

    Anybody else here from the veritasium video? 😂