The Truth About Toilet Swirl - Southern Hemisphere

  • Опубликовано: 3 июн 2015
    Both videos on one page (for desktop):
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    Some notes:
    We each repeated the experiment 3 times, and got the same results every time. For those of you who might be skeptical, great! A right circular prismatic kiddie pool is only $10 and you can do the experiment for yourself at your latitude. There's really no reason you shouldn't do it for yourself.
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    Gordon McGladdery did all of the sound design for the video. We used two songs from other artists (licensed of course). Derek split the first one up so it fades from video to video, and Gordon split the instruments up on the second one. There are violins on one video and percussion on the other for example. It's really neat.
    The neat earth animation at the beginning and the synchronizing timer was made by He also made still images of the earth from the top and the bottom.
    Thanks to Vanessa for filming in Sydney:
    There was a study performed at MIT years ago ( that explained the physics involved. We repeated some of these demonstrations, but on opposite sides of the globe…and in a way that can be easily understood.
    This site is a great resource on the Coriolis effect and ways people have gotten it wrong:

Комментарии • 6 122

  • Juan David Santamaría Sánchez
    Juan David Santamaría Sánchez 4 дня назад


  • χcεƨƨıνε Gεпıυƨ
    χcεƨƨıνε Gεпıυƨ 6 дней назад

    So in the northern hemisphere they're called hurricanes but in the southern hemisphere they're called cyclones?

  • psydwaindah
    psydwaindah 7 дней назад

    847 flat-tards took umbrage at this video! If we flushed them down a toilet which way would they swirl before they gurgled into oblivion?

  • John Johnson
    John Johnson 7 дней назад

    Great simple example to debunk flat earth theorist

  • Feanor K
    Feanor K 9 дней назад

    Do a video that teaches some science to flat Earthers please!

  • Bishop Racicot
    Bishop Racicot 9 дней назад

    we want more!

  • Lavuvzu Surat
    Lavuvzu Surat 11 дней назад

    This is a lie.

  • Lampardi Phosphorous
    Lampardi Phosphorous 12 дней назад

    Damn im on my phone

  • Hyacinthe1969
    Hyacinthe1969 12 дней назад

    Great job guys! Thank u both for ur efforts to help teach the world! :)

  • Sani R.
    Sani R. 13 дней назад

    whole video(s) gave me chills.. i felt very sciency aligning to videos and sync it. awesome video(s).

  • DoodiePunk
    DoodiePunk 13 дней назад

    I still don't understand, was there a difference from the southern hemisphere?
    I watched the video twice, but I still can't understand!

    • Kel Duck
      Kel Duck 12 дней назад

      It spins in different directions depending on the Hemisphere.

  • slaptoad
    slaptoad 15 дней назад

    Hello from the other side, I must've subscribed a thousand times

  • phychmasher
    phychmasher 16 дней назад

    That was so fun, thanks for the effort!

  • arno kosterman
    arno kosterman 16 дней назад

    It spins in the same way than the planet even the tree s have a spinn

  • arno kosterman
    arno kosterman 16 дней назад

    Strange that on quantum lv everyting spins the same way .
    Like the spinn Puls mather

  • Ju ch
    Ju ch 19 дней назад

    Marvelous executed

  • Ziggurat XYZ
    Ziggurat XYZ 20 дней назад

    That synchronisation experiment was absolutely fantastic.

  • Nitish Srivastava
    Nitish Srivastava 21 день назад

    What if I'm already happily subscribed to both of you?

  • That one Moon Base Alpha player
    That one Moon Base Alpha player 23 дня назад

    What about at the equator

  • A. Cesário
    A. Cesário 24 дня назад

    Amazing video! Congrats.

  • Khalis Suhaimi
    Khalis Suhaimi 25 дней назад

    (go to destin's video for the beginning of this comment)...ARE AWESOME!!!!!!

  • Matt
    Matt 29 дней назад

    What foolishness. The guy did the experiment ONE TIME. True science requires the experiment to be done several times. Was the pool on perfectly level ground? He didn’t take that into account. Here’s one more thing, which way does the water drain at the poles? I guarantee that it would spin in either direction. Everyone in here is congratulating this guy but no one thinks for themselves. Sheeple.

    • Kel Duck
      Kel Duck 26 дней назад

      Well most people read the description, they then find it was done 3 times each, so 6 times all up.
      Explain how non level ground will effect the rotation of the water?
      Your guarantee is worthless.

  • *User.Aaron*
    *User.Aaron* Месяц назад

    where you at Southern flat-earthers

    • Kel Duck
      Kel Duck 26 дней назад

      No FEers down here, we have education.

  • Renz Playz
    Renz Playz Месяц назад

    I can make a washing machine now

  • Jack Fredricks
    Jack Fredricks Месяц назад

    This video has more up votes and a few less down votes, yet the other has more views.

  • josorr
    josorr Месяц назад

    At the time of this post, (10:15p.m. CST January 13 2018) Derrick (Veritasium) has 2,353,129 views and 64,458 likes. Destin (SmarterEveryDay) has 2,593,141 views and 63,781 likes. So, Destin has more likes, but Derrick has more views.

  • Shaun Villar
    Shaun Villar Месяц назад

    So does a real clock run slower in the northern hemisphere? Surely it does as the same force directing the swirl in the water will have an effect on the hands on the dial?

  • Sastkryptlox
    Sastkryptlox Месяц назад

    Incredibly awesome idea - one of the best RUclip collabs I have ever seen!!

  • Genesis Apuan
    Genesis Apuan Месяц назад

    This was just perfect! Love the double video concept and it worked perfectly! Even at the end when Devin was on your channel the you went to Devin’s and your shoulder was left on your channel. I am not sure if y’all meant that or not but it made the double video meld together!
    Great explanation and experiment, too!

  • ShdwJho
    ShdwJho Месяц назад

    Dammit, got to the end of the synch, only to notice i watched both videos on the wrong sides... so I had both youtubers pointing the edge of my screen instead of each other...

  • Pramath Bhat
    Pramath Bhat Месяц назад +1

    am I the only one who didn't synchronize?

  • Computer Guy
    Computer Guy Месяц назад

    Sir, but the bathtub is very very very very very very small as compared to earth. So I don't think there will be any measurable or observable changes in the pool.

  • quinnster753
    quinnster753 Месяц назад

    I love how the like and dislike is so similar between these videos. It seems like everyone actually tried the video syncing and thats cool :)

  • Tim Cunningham
    Tim Cunningham Месяц назад

    My dual monitor setup with Destin on the left and Derek on the right was insane!

  • Matthew Holland
    Matthew Holland Месяц назад

    Haha that was awesome. Had to use my wifes phone and mine but that was cool!

  • Pzyko TV
    Pzyko TV Месяц назад

    This is the most original collaboration i have ever seen! I am amazed! Thank you so much for this!

  • Abdulmuati Asiri
    Abdulmuati Asiri Месяц назад

    Wow, that was amazing

  • Danny Forrest
    Danny Forrest Месяц назад

    Love it!

  • Peter Ryseck
    Peter Ryseck Месяц назад

    What would happen on the equator?

  • MDB
    MDB Месяц назад +1

    A. Is your backyard PERFECTLY level and would that make a difference?

  • Steve Mendoza
    Steve Mendoza Месяц назад never has been this useful.

  • Gear and Outdoor GER.
    Gear and Outdoor GER. Месяц назад


  • Cashback Man
    Cashback Man 2 месяца назад

    hi Destin, i'm in the middle of equator
    where will the water swirl?

  • Thumbnail Finder
    Thumbnail Finder 2 месяца назад

    I wasn't gonna play both at the same time, but I did.
    And I'm happy I did. Seriously great job.

  • Delve
    Delve 2 месяца назад

    I want more videos like this. Anyone have any?

  • RefleX
    RefleX 2 месяца назад

    What if your on the equator and do this experiment. Will it flow strait down?!

  • John Nanney
    John Nanney 2 месяца назад


  • Youmo Yan
    Youmo Yan 2 месяца назад

    Great work, BTW, Hank, I still love you.

  • John Mckerrell
    John Mckerrell 2 месяца назад

    there are no proof wee live on a spinning testical

  • BigLu
    BigLu 2 месяца назад

    That was soo cool. 🤣

  • MrFlippy Music
    MrFlippy Music 2 месяца назад

    e of my comment to finish the sentence.
    sense to you?
    ent so I know!

  • mike mcgln
    mike mcgln 2 месяца назад

    I DONT GET IT.............

  • wizbang68
    wizbang68 2 месяца назад

    I call shenanigans you pulled your hands out one to the left and one to the right so YOU created the swirl and was then followed by the drain.

  • Archangel Raphael
    Archangel Raphael 2 месяца назад

    A challenge to raise your game Veritasium?
    *All of the preachers and creatures and teachers have such a hard time using the S word when teaching 'we the sheeple' about science ...*
    please tell me WHY the idea called 'chiral' in physics seen as a very subtle force has NOTHING to do with the 'coriolis effect' and of course the '4-fold World TEACHER' a very fine diplomat of the idea called 'perpendicular'?
    the SwaStika World TEACHER is shadowing Veritasium
    Derek sadly ye are another fine mind unable to see the obvious hidden in plain sight, and instead of teaching about the simple EMPIRICAL facts regarding the 4-fold and 3-fold World TEACHER today making its emergence known as the gammadion in the world of nano and chiral meta-materials ye CHOSE to ignore it ... why?

  • Subeesh panthroli
    Subeesh panthroli 2 месяца назад +1

    tell me what is the direction of rotation at equator?
    Do this experiment at Ecuador

  • Farisan Hafizh
    Farisan Hafizh 2 месяца назад

    I liked and commented this video and the other at the same time

  • Forever Flat
    Forever Flat 2 месяца назад

    Dude this was terrible... MIT conducted this same experiment? Are they that dumb too? 1 pool? 1 sample? And you claim proof? Why didn’t you have 4 or 6 smaller pools. I just got dumber not smarter. I wouldn’t be surprised if NASA funded this experiment, unreal. 🤦‍♂️

  • Kevin Yang
    Kevin Yang 2 месяца назад

    So what happens when water is drained at the equator? At the very center.

  • Jarrey
    Jarrey 3 месяца назад

    Welp I only have my phone. Sad

  • jesokingcryst
    jesokingcryst 3 месяца назад

  • Garrett Neumann
    Garrett Neumann 3 месяца назад

    Subed because of destin.

  • Noorquacker
    Noorquacker 3 месяца назад

    Dang, these are some great videos

  • Kai
    Kai 3 месяца назад

    this was cool to watch with dual monitor setup :D

  • PecoraSpec
    PecoraSpec 3 месяца назад

    Finally i can squeeze some flatearther!
    I found you while i was bored on the internet, now i'm not bored anymore! Your curiosity make me feel less alone!
    Clockwise hugs!

  • Forever Flat
    Forever Flat 3 месяца назад


  • Brutis Thunderhand
    Brutis Thunderhand 3 месяца назад

    Flat Earthers would say it was the torus effect.

  • Ulrich Hoffmann
    Ulrich Hoffmann 3 месяца назад

    Great video! Another point goes to the oblong earthers. You guys seem smart...Any idea how I could get centipedes in my and my fathers body out? 250 Euro reward for any working method or cure, see my channel for details.

  • Gabriel Frisch
    Gabriel Frisch 3 месяца назад


  • Champy heteromer
    Champy heteromer 3 месяца назад

    oh man this is so cool
    and i comented on both videos! (what?)

  • Benjamin Pyke
    Benjamin Pyke 3 месяца назад

    OK, guys, I know you want to promote each other's channels and get more views on both ... but damn that was annoying ... I zoned out for a bit and wanted to skip back but I had to resynch. Really, just edit them together. (OK, I'll stop grumping. It was kind of fun, in an annoying way, like, I am rolling my eyes at both of you so hard right now (but not in a way that's affected by my hemisphere)).
    Also, can you please make a video of just food colouring going into a vortex like that - maybe for about five minutes? That was so beautiful and I'm sure you'll have something interesting to say about vortices.
    Alright, going to copy and paste this onto the other video now because this is what happens. Hmm, is this the original comment, or the copy?

  • Bhargava Jaisimha
    Bhargava Jaisimha 3 месяца назад

    I have been subscribed to both your channels from quiet some time.
    You guys make some of the most interesting videos on youtube and I'm a huge fan!!!!
    loved the concept of the whole double vid thing!!! (probably the best way to make a colab. vid!)

  • Kelly R
    Kelly R 3 месяца назад

    "Aaah derrrp why do you need two phones, Kelly?"

  • Jonathan Pilic
    Jonathan Pilic 3 месяца назад

    wow, awesome collaboration and at the time the subject is interesting.. the main thing is when I play both video synchronized my mind blow. I'm speech less this is new level.. it makes me giggle. I'm already watching and subscribes both smartereveryday and veritasium. thank you both of you and I/we expect more interesting science video in the future. applause....

  • LaneHD
    LaneHD 3 месяца назад

    This. Is. Awesome.

  • Ali Mahmoudi
    Ali Mahmoudi 3 месяца назад

    I think your experiment lacks accuracy by some orders of magnitude ... The difference in velocity caused by Earth's rotation at the location of Sydney for a pool with the diameter of 2m roughly will be 81 um/s which will cause an angular speed of 20 u rad/s ... Which requires far more precise experiment than the one you just performed. Just to make all this clear those sticks you used to show that the water in the pool is still will complete a full rotation in 3.6 days at 20 u rad/s

  • Jonathan Drwal
    Jonathan Drwal 3 месяца назад

    that was amazing, because at the end the way i had my windows positioned yall faced eachother perfectly

  • Chef Pyro
    Chef Pyro 3 месяца назад

    i still wonder how 500000 more people have watched the northern hemisphere part

  • John Smith
    John Smith 4 месяца назад +1

    We need 47 more dislikes to synchronize with the other douchebag

    ABSOREDACTOR 4 месяца назад

    That idea to sync was just genius! Definitely learned something today. But guys, as soon as the sync ends, ears star bleeding (Especially when you're using earphones). Anyways, a great way to make people understand the effect with a practical and entertaining approach! Great job guys. Thank you for this amazing content.

  • hanibal well
    hanibal well 4 месяца назад

    why does smarter every day have more views by 200000 views

  • FlyBoySee
    FlyBoySee 4 месяца назад

    So can we assume that if you had the very same pool at the north pole it would drain draight down? I will give 5 bucks to your patreon if you'd go there with Destin and experiment :)

  • Brew Bear Brewer
    Brew Bear Brewer 4 месяца назад

    Mind blowing video! Even with just the effects of having two videos synchronized! Woah!

  • x1RoBoT3x
    x1RoBoT3x 4 месяца назад

    So if I'm understanding this correctly, if this experiment were to be conducted on the equator, you would produce a portal to another dimension?

  • BC Pratt
    BC Pratt 4 месяца назад

    This experiment is not complete until you perform it at the Equator. Then you have to synchronize your equator video with these two videos.

  • daimon hellstrom
    daimon hellstrom 4 месяца назад

    Don't read the comments flat earthers are desperate to hold their beliefs.

  • Gabriele Di Carlo
    Gabriele Di Carlo 4 месяца назад

    Sync it up!

  • James Fernandez
    James Fernandez 4 месяца назад

    Hey guys, just a quick fyi, yes, coriolis is a real effect, but alas, no one could ever prove that the earth rotates. According to Mach's Principle, the SAME effect would be experienced on a stationary earth in a revolving starfield. Imagine the starfield as a spinning tire, whose center a gravity is empty space. You can put whatever you want in that space and the tire won't touch it. This is Mach's Principle, and is it ever more valid since: 1. No test ever conducted to prove the earth rotates, or moves at all for that matter, has succeeded, and 2. Mach's Principle requires the earth to occupy a unique position in the cosmos, and ALL quanitifable and measurable observations ever conducted have led to just that. Crazy, huh? Crazy awesome.

  • kiran muralee krishnan
    kiran muralee krishnan 4 месяца назад

    awsome mann..!!! awsome..!! the sync video..!! dope.!!!

  • Big Bulk
    Big Bulk 4 месяца назад

    Water at the edges is faster and thus displaces the one near the center creating a vortex, what I dont understand is what determines the direction. It's not that the earth is rotating a different direction in two hemispheres.

  • Jimmy Berry
    Jimmy Berry 4 месяца назад

    Try this with a straight drain pipe down, no bends.

  • droberts12345yt
    droberts12345yt 4 месяца назад

    I am a machinist in California. We have machined a lot of water well shafts, bearings and housings. I once asked one of the older pump guys why most pumps turned counter clockwise (ie left handed threads). The only answer he could give me was that left handed pumps were more efficient. When I explained the counterclockwise whirlpool thing I think he got it.
    I wonder if all the pumps down under are right handed. Hey! Derek Do you know what direction the water well pumps turn in Australia?

  • Anand Kamlapure
    Anand Kamlapure 4 месяца назад

    I appreciate that you showed the experiment in big container, but the point is, you should see in the sink and toilets too. The two sinks you show at @1:39 are just asymmetric, and then the motion is quite complicated. But if the sinks are symmetric, then you will the same effect there too.

  • Michael Teo
    Michael Teo 5 месяцев назад

    I'm guessing that you have some additional footage of you leveling the surfaces... but regardless, a plywood platform is hardly reliable to be perfectly level. I'm not conviced that you've eliminated all variables. You would also need to get the creases out of the bottom of the pools, shield the pools from electromagnetic influences, perform the experiment at the same time of day or night with the sun/moon in the same point in the sky and on similar phase of the moon cycle etc.
    I would have been transparent to see the results of the other two times you ran the experiment (especially if you spent another 24 hours each time waiting for the water to settle).

  • Greg Collins
    Greg Collins 5 месяцев назад

    You guys are the new "mythbusters"

  • Saad MAFiA
    Saad MAFiA 5 месяцев назад

    To read the end of this comm

  • chemistry4life
    chemistry4life 5 месяцев назад

    Sorry I'm two years late. To be slightly more scientific, the pool should both be filled clockwise as a control, observe the results, Then repeated when filled counter clockwise and observe the results. I suppose you may have done that, but wasn't shown in the video. If yours was filled counter clockwise and destin's clockwise, one may perceive the swirl to be opposite of the direction of filling the pool

  • 8bit72HAC
    8bit72HAC 5 месяцев назад

    This is really freaking cool

  • Marc
    Marc 5 месяцев назад

    That was the coolest way of watching a RUclip science video I've ever experienced, exept the end xD

  • videosaala
    videosaala 5 месяцев назадвидео.html

    • videosaala
      videosaala 5 месяцев назад

      Interesting.... Destin and Dr Derek!
      The link is about sleep direction with respect to hemisphere!

  • Jacques Homme
    Jacques Homme 5 месяцев назад

    I´m a Brazilian school teacher and I´m involved to create here in my country a educational alliance based on RUclip.
    You probably won´t believe on me, but nowadays we're facing troubles with flatearthers, in the most they are creationists and b YoungEarth believers, actively trying to destroy our already poor educational level.
    I'd like to have your authorization to use parts of your video on a video-lesson I'm preparing. I have no intention of any profit with such video, but it'll be a honor to refer your excellent material.
    I hope for your authorization...
    My best regards
    Prof. Jacques Homme