The golden ratio | Introduction to Euclidean geometry | Geometry | Khan Academy

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  • Опубликовано: 7 янв 2025

Комментарии • 432

  • @nonchalantd
    @nonchalantd 11 лет назад +260

    I realize how interesting math can be now that I am not under pressure to learn it.

  • @jarjarquan
    @jarjarquan 8 лет назад +204

    I hate math at school. It's stressful and I dread doing the work. But when I'm learning about it on my own (like watching this video) I love it!

    • @vwlz8637
      @vwlz8637 8 лет назад +17

      school is not for learning.

    • @WhistlingFartBox
      @WhistlingFartBox 8 лет назад +17

      you learn math at school to pass a standerized test so the school doesn't lose funding.

    • @mukeshd7045
      @mukeshd7045 8 лет назад +1

      good videos sal

    • @swal593868
      @swal593868 8 лет назад +5

      Dank Hill Really recommended you try Khan website. It's fantastic and FREE to use. Also try You Tube's HEGARTYMATHS CHANNEL. It is based on 🇬🇧exams, but the ideas are explained clearly, and the videos are quick to view. Regards Samantha Wallace ps Good Luck!

    • @anushkapatwal7361
      @anushkapatwal7361 5 лет назад

      True

  • @undeddjester
    @undeddjester 11 лет назад +46

    Wow... Got given a programming problem to solve looking at fibonacci's sequence, read the equation and could not see where the hell it came from. Spotting something about "The golden ratio", I decided to go searching for that, which in turn led me here...
    How the hell can such a simple idea of having a line with the ratio of "a to b" being the same as "a+b to a" produce something so fricking awesome!? Mind officially blown. Thanks muchly ;)

    • @swagmaster282
      @swagmaster282 4 года назад +1

      @@formulaint I think it is, I got it too

  • @jayveritasmusic
    @jayveritasmusic 9 лет назад +65

    This is great! I'm frustrated though that math is being dumbed down in public school. Like the math in this video isn't that complex, but when I show it to my teacher in ninth grade HONORS its treated like some kind of disease and I'm being told that it's too "hard" to do in class. Like seriously we should be allowed to learn at our own pace and not be put down to learn simple formulas that we've learned in the sixth grade!

    • @EndlosesNichts
      @EndlosesNichts 9 лет назад +8

      +Jacob Rajacich it´s the same shit here in germany. But I always think that it´s just annoying to me, because 98% of my math class doesn´t want to learn more or anything AT ALL about math.

    • @swaggkidd4192
      @swaggkidd4192 9 лет назад +1

      Lol stop boi, you just want attention and for people to think ur smart. It doesn't take any intelligence for a 9th grader to understand this conceptź

    • @yassinlabichi6522
      @yassinlabichi6522 9 лет назад +15

      +Swagg Kidd given your name and how you try to type things,I would say you are the one who wants attention

    • @yassinlabichi6522
      @yassinlabichi6522 9 лет назад +3

      I'm pointing something out

    • @jezraiyellefranchezckagray2379
      @jezraiyellefranchezckagray2379 9 лет назад

      +Amazing Ike ikr

  • @carlosalexandreFAT
    @carlosalexandreFAT 2 года назад +2

    The association of the main numbers in the field of mathematics with each other, reflects numerical sequences that correspond to the dimensions of the Earth, the Moon, and the Sun in the unit of measurement in meters, which is: 1' (second) / 299792458 m/s (speed of light in a vacuum).
    Ramanujan number: 1,729
    Earth's equatorial radius: 6,378 km.
    Golden ratio: 1.61803...
    • (1,729 x 6,378 x (10^-3)) ^1.61803 x (10^-3) = 3,474.18
    Moon's diameter: 3,474 km.
    Ramanujan number: 1,729
    Speed of light: 299,792,458 m/s
    Earth's Equatorial Diameter: 12,756 km. Earth's Equatorial Radius: 6,378 km.
    • (1,729 x 299,792,458) / 12,756 / 6,378) = 6,371
    Earth's average radius: 6,371 km.
    The Cubit
    The cubit = Pi - phi^2 = 0.5236
    Lunar distance: 384,400 km.
    (0.5236 x (10^6) - 384,400) x 10 = 1,392,000
    Sun´s diameter: 1,392,000 km.
    Higgs Boson: 125.35 (GeV)
    Golden ratio: 1.61803...
    (125.35 x (10^-1) - 1.61803) x (10^3) = 10,916.97
    Circumference of the Moon: 10,916 km.
    Golden ratio: 1.618
    Golden Angle: 137.5
    Earth's equatorial radius: 6,378
    Universal Gravitation G = 6.67 x 10^-11 N.m^2/kg^2.
    (((1.618 ^137.5) / 6,378) / 6.67) x (10^-20) = 12,756.62
    Earth’s equatorial diameter: 12,756 km.
    The Euler Number is approximately: 2.71828...
    Newton’s law of gravitation: G = 6.67 x 10^-11 N.m^2/kg^2.
    Golden ratio: 1.618ɸ
    (2.71828 ^ 6.67) x 1.618 x 10 = 12,756.23
    Earth’s equatorial diameter: 12,756 km.
    Planck’s constant: 6.63 × 10-34 m2 kg.
    Circumference of the Moon: 10,916.
    Golden ratio: 1.618 ɸ
    (((6.63 ^ (10,916 x 10^-4 )) x 1.618 x (10^3) = 12,756.82
    Earth’s equatorial diameter: 12,756 km.
    Planck's temperature: 1.41679 x 10^32 Kelvin.
    Newton’s law of gravitation: G = 6.67 x 10^-11 N.m^2/kg^2.
    Speed of Sound: 340.29 m/s
    (1.41679 ^ 6.67) x 340.29 - 1 = 3,474.81
    Moon's diameter:: 3,474 km.
    Cosmic microwave background radiation
    2.725 kelvins ,160.4 GHz,
    Pi: 3.14
    Earth's polar radius: 6,357 km.
    ((2.725 x 160.4) / 3.14 x (10^4) - (6,357 x 10^-3) = 1,392,000
    The diameter of the Sun: 1,392,000 km.
    Numbers 3, 6 & 9 - Nikola Tesla
    One Parsec = 206265 AU = 3.26 light-years = 3.086 × 10^13 km.
    The Numbers: 3, 6 and 9
    ((3^6) x 9) - (3.086 x (10^3)) -1 = 3,474
    The Moon's diameter: 3,474 km.
    Now we will use the diameter of the Moon.
    Moon's diameter: 3,474 km.
    (3.474 + 369 + 1) x (10^2) = 384,400
    The term L.D (Lunar Distance) refers to the average distance between the Earth and the Moon, which is 384,400 km.
    Moon's diameter: 3,474 km.
    ((3+6+9) x 3 x 6 x 9) - 9 - 3 + 3,474 = 6,378
    Earth's equatorial radius: 6,378 km.
    By Gustavo Muniz

  • @TrusterVision
    @TrusterVision 11 лет назад +17

    The Golden ratio is also found the our DNA helix, the bronchial tree structure of the lung, the heart valves, etc..... This is not just a ratio... It is nature's ratio. Very intriguing indeed.

  • @Adam-jo3tr
    @Adam-jo3tr 5 лет назад +7

    Sal I love how excited you get about math and concepts like this. I feel like these things can be mind-blowing and it's so cool to have someone to share this with, even if it's just me at home watching your videos. So proud of everything Khan Academy has become

  • @TimothySmithMIPM
    @TimothySmithMIPM 12 лет назад +1

    Very straight forward. Just look at the basic definition: φ = a/b.
    Thus if a = 10, φ = 10/b = 1.618, or b = 10/φ
    And that is even more fun if you remember that 1/φ = φ - 1, so you can do that in your head.
    φ - 1 = 0.618 times 10 = 6.18 units (cm for this case)
    So side A = 10, side B = 6.18...
    GREAT video!!
    PS, obviously I'm only using the first 3 digits of φ for calculations.

  • @monzur1947
    @monzur1947 9 лет назад +58

    10:10, "Let me scroll down a little bit," scrolls up.

    • @xxxXLopesXxxx
      @xxxXLopesXxxx 9 лет назад +1

      +Monzur Rahman Some mouses are actually inverted.

    • @NondescriptMammal
      @NondescriptMammal 9 лет назад +4

      Maybe he is in Australia

    • @SigSelect
      @SigSelect 7 лет назад +1

      I think it's safe to guess Sal uses a Mac.

    • @therealspaghetti208
      @therealspaghetti208 6 лет назад

      Monzur Rahman lmaooooooo

    • @vinaysharma-sm1ff
      @vinaysharma-sm1ff 3 года назад

      @@xxxXLopesXxxx in order to understand this, he needs to buy a mac first.

  • @fredlunau
    @fredlunau 12 лет назад

    Started watching this as a goof to myself, and just couldn't stop watching. Now THAT is teaching.

  • @odean14
    @odean14 10 лет назад +13

    holy crap thats amazing!

  • @mdhussain9458
    @mdhussain9458 4 года назад +3

    Such a beautiful equation I ever see in my life. I love Mathematics now!!!!!!!!!
    😢😢😢

  • @alexkeila
    @alexkeila 9 месяцев назад

    One of the best Khan Academy videos ever!!! I have watched dozens of times!! Every time I think of φ, I return to this video just for fun!!

  • @mohammads1987
    @mohammads1987 12 лет назад +3

    I followed everything it was so awesome. I was doing a research essay on this topic and I got an A+ on it.

  • @avikaalgond4470
    @avikaalgond4470 8 лет назад +8

    Very interesting ................. a great wonder i just liked it a lot Thanx for dis wonder creation.!!!

  • @stuflikethis
    @stuflikethis 12 лет назад

    this vid should be viewed in every math class

  • @Ifrumnoj
    @Ifrumnoj Год назад +1

    I have always loved Math. I do stem talks at my kids schools and I tell them math is the key to the universe which it is.

  • @thewhatever379only
    @thewhatever379only 13 лет назад

    I consider myself as a pretty good amateur at investigating this number already. but you've blown my mind away

  • @OmicronIII
    @OmicronIII 11 лет назад +3

    Having never studied them myself, I have to take Discovery Channel's word for it that the Golden Ratio was used extensively in ancient architecture; the Parthenon being one of them. Also as I understand it, there are a great number of archways with this ratio measuring from base to sides and up to just where it terminates with the arch its self. It’s also in the windows of some churches. (as I understand it)

  • @Frisbinator
    @Frisbinator 10 лет назад +1

    I read 1/2 of the book about the golden ratio by Mario Livio, I gave up on it because I wasn't really grasping all that was said, but this video really cleared things up, I'll probably head back into it now, thanks so much for your time and effort, the way you use colors and simple explanations is very helpful and clear.

  • @EdgeRetro
    @EdgeRetro 13 лет назад

    Cool timing for this video. I am preparing to build a door to my house, and was considering incorporating the golden ratio into the design for fun. You've explained some things here that I didn't know about it. Thanks!

  • @Risayume
    @Risayume 8 лет назад +11

    I personally found this video very confusing. It didn't really explain what phi was in the beginning of the video and went right into some equation that was afterwards explained as the golden ratio. I was beyond confused. I also would like to see that the work is more organized, it looks like its written it all over the place.

  • @AlexSpencerAZ
    @AlexSpencerAZ 10 лет назад

    This may be the coolest video on the internet. Thanks, Sal!

  • @1LHerne
    @1LHerne 12 лет назад

    you could go this way as well: a^2 -ba -b^2 = 0 and solve for a, choosing the positive answer: a= b(1+sqrt(5))/2. Then use this in a/b and get the golden ratio as (1+sqrt(5))/2

  • @Jimmygotdis
    @Jimmygotdis 12 лет назад

    The best part is, is that there's still so much more to it.

  • @bluegrassreb1
    @bluegrassreb1 12 лет назад +1

    yes. it is the result of Fibonacci numbers being added to the previous numeral in the sequence. then dividing it

  • @37rainman
    @37rainman 11 лет назад

    Because that is what the golden ratio is. 2 numbers in this ratio added together, divided by the bigger one, exactly equals the bigger one. Spend some time with it to understand it. The golden number, 1.6180339.... is the only number that you can square by adding 1, and find the reciprocal by subtracting 1. a over a does =1. b over a =.6180339, those added = golden number. To make the ratio to any desired accuracy, you can add any 2 numbers, add that result to th previous, and the more times>

  • @LiwaySaGu
    @LiwaySaGu 4 года назад

    This video is the best fundamental mathematical explanation of the golden ratio online. THANKS a lot!!!!!

  • @haseeb8597
    @haseeb8597 8 лет назад +3

    Thanks, this Video was really helpful.

  • @xfire909
    @xfire909 12 лет назад

    this is the best video i have honestly seen. It is educational and took my thinking to a new level i never though achievable. THANK YOU

  • @real_manikant
    @real_manikant 10 лет назад +2

    an excellent source for studying maths

  • @SkwurrelllCheakz
    @SkwurrelllCheakz 12 лет назад +1

    just discovered this channel, three thousand eight hundred and four more video's to go

  • @theterabyte
    @theterabyte 13 лет назад +1

    Sal - I seem to recall the golden ratio has something to do with the sub-linear implementation of Fibonacci in programming. I never took the time to learn it. I'd love it if you can make a video about how to calculate Fibonacci numbers is sub-linear time based upon this.
    Awesome Video! Thanks!

  • @TwiceZone.
    @TwiceZone. 3 года назад +2

    THANK YOU SO MUCH I FINALLY HAVE INFINITE ROTATION

  • @Jwatson996
    @Jwatson996 12 лет назад

    This guy is SOOOOOOO SMART!!!!!

  • @swamiworldtraveler
    @swamiworldtraveler 11 лет назад

    *BEST introductory treatment I have found, yet! (and I have been THOROUGHLY researching it.) The major interrelationships are presented in an excellent order and fashion. Also, the largely mathematical treatment is refreshing, in light of the "sacred connections", "wild speculation", and misinformation (albeit, unintentional) found all around.
    Thank you Khan Academy for another GREAT JOB!
    P.S. For the record, the nautilus shell is indeed an "equiangular spiral", but alas NOT on phi. Close, but no cigar :(

  • @37rainman
    @37rainman 11 лет назад

    >you do that, the more exactly 2 consecutive numbers will = phi. Ex: 1+2=3;2+3=5; 3+5=8; 5+8=13--and so on. The more u do that the more accurately the ratio of the last 2 numbers will = phi. Try it. If you do it around 20 times it will be to the accuracy of an 8 digit calculator. The fascination things about th ratio are endless.

  • @anushkapatwal7361
    @anushkapatwal7361 5 лет назад

    This is gr8 it makes maths a fun way of learning and I was so bad at maths before but now I have improved

  • @knartfocker_
    @knartfocker_ 3 года назад

    TI-85 is the best TI. Great lesson!

  • @abhideepsingh4484
    @abhideepsingh4484 8 лет назад +1

    awsome explanation and an intiguing concept!!!

  • @decipherify
    @decipherify 13 лет назад

    this ratio is really exciting! that spiral thing seems paradoxical to me.I hope that Sal will upload more videos about it.

  • @shadow_self8564
    @shadow_self8564 4 года назад

    This video is pure sunflower 🌻

  • @TheTolgtolg
    @TheTolgtolg 11 лет назад +1

    this is pretty amazing. and your teaching skills are pretty awesome too. thanks for sharing

  • @OmicronIII
    @OmicronIII 11 лет назад

    ***looking agrily upward... shaking fist*** KHAAAAAN! I love that you did this. Rock on, man.

  • @BigTinoBambino
    @BigTinoBambino 13 лет назад

    we're actually using this video in our trig class

  • @ChrisWilliamsRMWpigeon
    @ChrisWilliamsRMWpigeon 13 лет назад

    shapes make it easier, single pointedness 1, eye or flame 2, triangle 3, square 4, pentagon 5, hexagon 6 ect
    all these shapes hold the triangle in them, and is easier to see when 3d :) its metatrons art and language of numbers :)

  • @miaraenaogoy8403
    @miaraenaogoy8403 4 года назад

    This was really helpful. Thankss

  • @brianab.8136
    @brianab.8136 7 лет назад

    I feel super smart for understanding this whole thing. Lovely!!

  • @zinzolin14
    @zinzolin14 11 лет назад

    Wow, I watched that whole entire video... But anywhoo, Thanks for the info! You explained it better than any other site I visited

  • @longhoang3096
    @longhoang3096 10 лет назад +1

    That just blew my mind

  • @arunfar100
    @arunfar100 13 лет назад

    This is very interesting and educative. Golden ratios are asthetically perfect ratios.

  • @titanjason8335
    @titanjason8335 3 года назад

    The first time Math made me smile 😀

  • @ChriSportGuy
    @ChriSportGuy 12 лет назад

    MIND BLOWN

  • @AJMTT
    @AJMTT 11 лет назад

    This video is so elegant!

  • @YPwnU97
    @YPwnU97 12 лет назад

    This isn't only amazing to mathematicians, it's amazing towards everyone!

  • @AvidanBorisov
    @AvidanBorisov 12 лет назад

    Pretty simple, since we know that phi^2 = phi + 1.
    then we multiply both sides by phi and we get:
    phi^3 = phi^2 + phi
    but we already know that phi^2 = phi + 1, so:
    phi^3 = phi + 1 + phi
    phi^3 = 2phi + 1

  • @genmasaotome3503
    @genmasaotome3503 11 лет назад

    This is awesome... I saw the same thing in wiki and I didnt get it until I watched this.

  • @rewind718
    @rewind718 12 лет назад

    The number 4 is always used in the quadratic formula :) If you're still confused, just google the quadratic formula and plug the values in for a, b, and c.

  • @t850terminator
    @t850terminator 8 лет назад +34

    Reading JoJo helps with this. :D

    • @dasemmiyogurt6288
      @dasemmiyogurt6288 5 лет назад +8

      Well jojo reminded me that this exists and I wanted to regain the knowledge how to calculate it.

  • @ritikthakur5844
    @ritikthakur5844 8 лет назад

    Fantabulous! I'm speechless.

  • @Jodathon
    @Jodathon Год назад +1

    "Hey i wasnt listening, can you repeat that one more time?"

  • @steja8973
    @steja8973 4 года назад

    Nice sir iam enjoyed well😊😊😊

  • @kchannel5317
    @kchannel5317 6 лет назад

    This video needs way more views, this is literally the mathematics of beauty.

  • @leomckee-reid5498
    @leomckee-reid5498 10 лет назад

    A cosmic gem of comedy

  • @Realityscopee
    @Realityscopee 3 года назад

    perfect!!! Thank u!!

  • @PASHKULI
    @PASHKULI 3 года назад

    φ² = φ + 1
    φ = (√φ)²
    φ² = (√φ)² + 1² this is the Golden triangle (Kepler's triangle), written in Pythagorean form, so it is a right angle triangle, which hypotenuse is φ.
    By the way from here and the unit square we can see the connection between φ and the REAL VALUE of π. Thus π = 4 : √φ = 3.144...

  • @ODogg870
    @ODogg870 11 лет назад +1

    Now that is amazing, I'm in love with the Golden Ratio

  • @elriheim67
    @elriheim67 12 лет назад

    supreme mathematics at work!

  • @amitavaroy9476
    @amitavaroy9476 4 года назад

    Proud of Shridhar Acharya who developed the quadratic formula

  • @orcasem
    @orcasem 11 лет назад

    Complexity is intriguing, you'll learn that one day.

  • @kakooge
    @kakooge 4 года назад +1

    ITS THE SECRET TO THE INFINITE SPIN JOHNNY!

  • @Goldbergfan91
    @Goldbergfan91 13 лет назад

    Awesome. I hadn't considered either the continued fraction or continued root form of phi.

  • @superdau
    @superdau 13 лет назад

    @theterabyte
    Maybe you mean the fact that the quotient of two adjacent fibonacci number converges to the golden ratio? (quotient of 89/55 (10th/9th fib.nbr.) already is 1.618). You can use this fact in a way like this: f(n) = floor(phi^n / sqrt(5) + 1/2).
    btw. you can start with any two integers and apply the fibonacci algorithm and the quotient will still converge to the golden ratio! It really is somehow magical ;)

  • @MrDevin666
    @MrDevin666 13 лет назад

    Genius, damn you have so much knowledge.

  • @SirSoup420
    @SirSoup420 12 лет назад

    A cool way to find phi with any starting number other than 1.
    Let: x be a number not equal to 1.
    Phi = ((1/x + 1)

  • @Jwatson996
    @Jwatson996 12 лет назад

    What thing did U use to create this?????? ITS SO AMAISING!!!

  • @ChrisWilliamsRMWpigeon
    @ChrisWilliamsRMWpigeon 13 лет назад

    the number of solutions is the mass results of a ratio, which means the effort using numbers is more relative and has its educating spiral, if this inteligence itself is a manifestation, its the number of the golden ration, which makes the fibonacci numbers interesting, the missing fibonacci numbers are the skipped sections to speed up patterns :) this phi number is 3 if its cycling, trinity :P triangle is in any shape ;)

  • @swizzbeats1212
    @swizzbeats1212 11 лет назад +2

    Awesome!

  • @devilmirror1
    @devilmirror1 12 лет назад

    @Jeorney Dude, it's not that mystery actually. Since, 2cos(Pi/5) = 2cos(36deg) = Phi
    666 = 36deg x 18.5 or you increase your circumference distance a multiple of 36 degree
    6*6*6 = 36deg x 6 (same analogy)
    As a result, the sine and cosine of evil number will be associate with Phi. However, it's very cool and flashy when you got the number from the calculator ;-)

  • @troysliney1269
    @troysliney1269 11 лет назад

    this helped me so much thank you

  • @ohh338
    @ohh338 7 лет назад

    I will have to watch this again sir.. too much information like this makes my head hurt and makes me cry sometimes

  • @JonMascar
    @JonMascar 10 лет назад +2

    What mic do you use? It's amazing.

  • @JOKOTOMO
    @JOKOTOMO 6 лет назад

    Thanks 😀

  • @LittleMissArabXX
    @LittleMissArabXX 11 лет назад

    GENIUS AT WORK !! :D
    Thanks !!!

  • @myteenager6277
    @myteenager6277 10 лет назад +2

    THIS GUY IS BOSS

  • @GeorgePapageorgakis
    @GeorgePapageorgakis 10 лет назад +8

    Nice lecture. The number of nuture itself ! I always feel strange when i hear greek words or letters pronounced in this weirdo english way... Fie and pie :| Its just φ=fi and π=pi

    • @aaamarco3
      @aaamarco3 10 лет назад

      You're suggesting that we know of a propper way to pronounce them?

    • @GeorgePapageorgakis
      @GeorgePapageorgakis 10 лет назад +4

      actually it sounds like π = pee and φ = fee. Its just that natives will always notice the differences :p

  • @StevenZB1
    @StevenZB1 13 лет назад

    If this interests you at all, look up Metatron's Cube and the Flower of Life. It's almost scary how the Universe's patterns have been known for a while now.

  • @maxwellsequation4887
    @maxwellsequation4887 4 года назад

    Beautiful ❤️ mathematics

  • @37rainman
    @37rainman 11 лет назад

    Have you also noticed that u can raise phi to any positive odd integer power, find the reciprocal, and that equals the decimal part of the number. Example: 1/phi^1=1.618033....minus 1. (naturally!) But notice that 1/phi^7 exactly equals the decimal portion of phi^7. Hallelujah!
    Also one can find a (little more complicated) similar relationship with phi raised to even positive integer values, but i leave that to you.

  • @domesdaylines
    @domesdaylines 11 лет назад

    Thank you so much!

  • @saminm1
    @saminm1 13 лет назад

    Mind= AMAZED

  • @Mythikal13
    @Mythikal13 3 года назад +1

    I will always laugh how teachers always had a terrible answer for how math was ever going to be used in real life. Always "how u gonna calculate interest or be architect or something" not "look at a pinecone, if you count the points, it's the fibonacci sequence. Math is nature, its everywhere"

  • @rollm94
    @rollm94 12 лет назад

    The best! :) I liked it :)

  • @NektariosK
    @NektariosK 10 лет назад

    Thanks for the explanation! Really nice video!

  • @someonetoogoodforyou
    @someonetoogoodforyou 13 лет назад

    Thanks Sal! This is a really great video. But is it possible that you could not rely on colors so much? I think I speak on behalf of your colorblind audience when I say that it's quite difficult to notice when a line starts and ends. Once again, awesome video :)

  • @VimukthiPankaja
    @VimukthiPankaja 11 лет назад

    Awesome video

  • @silencedidgood
    @silencedidgood 13 лет назад

    I am only 3 minutes into this lesson but I am stopping the video here as I want to savor it. I think this video combined with Donald Duck in Mathemagical Land could easily account for a good creative semester!

  • @TheMtnManFromTennessee
    @TheMtnManFromTennessee 12 лет назад

    Thanks. Succinct and entertaining, and understandable.

  • @daedra40
    @daedra40 11 лет назад

    Recursive and phi is so cursive looking. Once again my mind is blown

  • @moptfor
    @moptfor 11 лет назад

    love it, thx