The Truth About Toilet Swirl - Northern Hemisphere

SYNCHRONIZE WITH DEREK'S VIDEO: bit.ly/Southern...
Both videos on one page (for desktop): bit.ly/ToiletSwirl
Subscribe to Veritasium: bit.ly/Sub2Veri...
TWEET THIS! bit.ly/ToiletSw...
↓↓↓↓↓↓↓More info Below ↓↓↓↓↓↓↓
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GET SMARTER SECTION:
Some notes about this.
We each repeated the experiment 3 times, and got the same results every time. For those of you who might be skeptical, great! The good news is that right circularly prismatic kiddie pools are only $10 and you can do the experiment for yourself at your latitude. There's really no reason you shouldn't do this on your own, so before you criticize how we've done it, I'd strongly encourage you to do it for yourself.
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SmarterEveryDay
Veritasium on Instagram: / veritasium
Patreon Support Link: / veritasium
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/ veritasium
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 eisenfeuer.com/. He also made still images of the earth from the top and the bottom.
Thanks to Jacob Vehrs for helping make the plywood pool platform.
GET SMARTER SECTION:
There was a study performed at MIT years ago (web.mit.edu/hml...) 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:
www.ems.psu.edu...
The Coriolis Effect influences the flight of a bullet.
www-das.uwyo.ed...
We would love for someone to replicate this demonstration. Please tweet your results to us @SmarterEveryDay and @Veritasium.
Here's the link to puchase the exact same pool:
www.amazon.com/...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tweet ideas to me @SmarterEveryDay
The thought is it will help educate the world as a whole, and one day generate enough revenue to pay for the kids' education. Until then if you appreciate what you've learned in this video and the effort that went in to it, please SHARE THE VIDEO!
If you REALLY liked it, feel free to pitch a few dollars towards their college fund by clicking here:
bit.ly/KidsCollege
Warm Regards,
Destin

[@Kmcornell23]

This was uploaded 4 years ago. Why am I just seeing it now?! This was great!

[@banaanipassifin4159]

Yeah same, Ive even searched this topic and got some idiots instead of these 2.

[@drwaffles7435]

I know right?

[@MarkJolley]

me too today

[@JurgenBoes]

same here

[@PeteKay]

im asking same question a year later than you....hope all is well

[@TheKingofRandom]

I can appreciate the genius that went into conceptualizing and editing this. Best collaboration I've ever seen. Like!

[@anotherluckydad]

So... maybe we could ponder the thought, "space as we know it is a giant kiddie pool being drained by ? and into ?". (thinking that ponder, just made everyone slightly dumber).

[@bytesman23]

That was pretty trippy watching the two videos together. Thanks for sharing that.

[@sciencestararvinsinghk]

It so cool. I subscribe to u and the makers of the video

[@hermanportorreal8409]

Grant Thompson - "The King of Random" heyy whats up grant

[@fionameehan133]

0:22

[@Nighthawkinlight]

Unbelievable! This is the best execution of a KZbin based experiment I've ever seen! Way to go guys, this is going down in the hall of KZbin fame.

[@marwanahmed9234]

You should really colab with them! It would be awesome

[@AlexMercer77]

Yeah man. You've got some good material. You guys should co-op.

[@holacom363]

I also love your vids man

[@m3ch1n39]

NightHawkInLight couldn't say it better!

[@eeera964]

1 test and not testing to get counter results is not "real". Sad U say the is a "best example" of any science. Simple filling is not enough counter testing not to mention closely irrelevant as the pool settled before as well as the drain point influence is obviously the main bias that should be purified.

[@MozartJunior22]

Legend says, Destin was setting up the pool to do his part of the video, but then he punctured it on the side to get laminar flow, thus the 3 year delay on his part

[@XavierBetoN]

He does that a lot..

[@smartereveryday]

I hope you enjoy trying to figure out how to Synchronize this video with Derek's video. bit.ly/SouthernSwirl We literally spent 3 years planning and executing this. We hope this answers the toilet swirl question once and for all!

[@ElNeroDiablo]

SmarterEveryDay I watched this on the site with synchronisation, and it was flipping awesome!

[@christianhargreave3758]

SmarterEveryDay I managed and it was great! Thank you so much, it was very interesting and surprising, it wont help me with my physics exam tomorrow, but it was good none the less

[@RtCarolina]

SmarterEveryDay That was MIND BLOWING !!! I am in awe... Thank you for making us smile while we think, "Rt"

[@Baloth86]

SmarterEveryDay Veritasium Syncing is pretty easy if you own 2 Screens ^^ One Video on the left Screen, one on the right, pause one of them at "1" on the countdown, Start the other Video, wait for the "1" and press play on Video 1 ^^ worked great but if you do something like this again please indicate which Video should be on the left and which should be on the right... Since I watched this Video on the right your Conversation from 6:01 seemed a little weird ^^

[@Rickardsson99]

SmarterEveryDay. Just watch one of angels. Real weird. Oh and make this again!

[@deanwcampbell]

Dude that video synchronization was one of the coolest things I've seen on the internet in a long time! Thanks guys.

[@WagwanItsBonbon]

these synchronised videos were by far the greatest thing i've ever seen on youtube to date and it really makes me wish the youtube five star rating system is still a thing!

[@andrewtoering4237]

Lol I know what wagwan is but I read this wag wan as in what tails do and ran with a double u. Gave me a nice chuckle.

[@X-Gen-001]

The last time I had my face that close to a toilet, I was being reminded why I should never mix my drinks.

[@mulgerbill]

Did you get the same awesome colour swirls?

[@X-Gen-001]

@@mulgerbill Indeed I did. It was a veritable technicolor nightmare :)

[@maankiimbaad948]

Hahaha no comment, but I like how honest you are.

[@ophiolatreia93]

X Gen well a toilet was a stupid place to mix them no wonder you got sick

[@omegaseamaster1550]

Yup, drivin the porcelain bus a few times myself. The techno colors where amazing too, from what I could remember

[@Fooglmog]

This video has 120,000 more views than the other one... which means there were 120,000 very confused people who watched this and wondered about the long pauses.

[@fett716]

im on my phone so the long pauses were pretty hilarious

[@deathman1687]

I am on mobile though

[@dilennoris6547]

Wrong.

[@kevinmcd112]

I was wondering about the long pauses. Even so, after watching each video, it makes sense but of course, it makes more sense with both going at the same time.

[@kevinmcd112]

... or it could just mean 120,000 people watched half of the video twice. The end of the synch was a little strange the first time.

[@LockStockNBarrel]

The best part was, I had destins video on my left monitor and veritasium on my right monitor so at the end when they were walking back and forth from channel to channel it was actually accurate. Best video ever.

[@ThomasPakh64]

Enduro MF Exactly what I did! Pretty cool!

[@malsh33]

Thomas Pakh me too, I even forgot they were two different videos.

[@stonewall01]

Enduro MF I only have a single monitor but I opened up two windows and moved them to the sides (via Windows 7) so they each took up half the screen. It worked marvelously! I am going to get my laptop out later and try it with that though.

[@rheniformer]

Enduro MF Around 6:02 to 6:39 on the time scale; When they were walking from screen to screen they were in the same parking lot. Check the background, it got me the first time I watched it, didn't notice the back ground until I brought up and synced both vids. I'm not finding fault with anything, just wondering if any one else noticed. It was a very good video, the illustration was very effective - also I had no idea that hurricanes swirl in opposite directions north and south.

[@stonewall01]

rheniformer Just a few moments, at 6:08 naturally on both videos, before that when Destin was waving his hands you can see his left hand only for an instant on Derek's.

[@AndrewMackoul]

I realized at the end that I had the two videos on the wrong side of the screen. THIS WAS VERY COOL!

[@lucidexistance1]

Andrew Mackoul Me too, when they said to subscribe to "This guy" and pointed away from each other. (hehe) It was oddly fun to synch up the vids to watch.

[@MrEDMeaner]

Andrew Mackoul Seems I got lucky on that point! You will have also missed the cool crossover globe graphic they did ;)

[@AndrewMackoul]

Benjamin Davis Yeah, it look weird at first, they should have said which video to go either left or right

[@Watermaker]

Andrew Mackoul Same

[@jaagup]

Andrew Mackoul I got it all right from the beginning, i was just lucky.

[@irudi]

That was the coolest thing ever! The two videos side by side! Genius!

[@cillianmurphy8652]

🤓

[@smartereveryday]

If you're having trouble syncing up the videos here's a pro tip: kzbin.info/www/bejne/noSuYZ-jbr-EnaM

[@WillGrace96]

I so wish I could come up with something to collaborate with you on! Love your work!

[@MongrelShark]

Or you could just use this double player link. youtubedoubler.com/fFRi

[@chuckydickens7258]

SmarterEveryDay Holy Carpcicles! That was some of the best internetting I've seen in months! Loved the video guys, though I couldn't stop shaking my head in disbelief that you did this. It was awesome! Had no issues synching, got it second try.

[@carlwitt7950]

SmarterEveryDay Very well done. Bravo to both of you.

[@MadnerKami]

SmarterEveryDay That was... awesome. Finally a good reason to have more than one monitor :)

[@KevinLambertperfected]

This is one of the coolest experiments on youtube i've ever seen. I love both Derek and Destin, Seeing you guys collaborate to this extent was such a treat. Thank you so much!

[@CamonDraconis]

[@FrankGutierrezzz]

Did you watch both at the same time? It was kinda weird . Yet, satisfying .

[@Ironhatchy]

I was watching both videos at the same time and was so amazed how synchronized they were. Thank you guys for establishing this myth.

[@sofianikopoulou7178]

I was thinking exactly the same thing and I believe that the editing job is much better than the experiment itself! Amazing piece of art!

[@Ironhatchy]

sofia nikopoulou I concur. The editing and splicing were on point.

[@guyingrey1072]

hi

[@bdk1749]

Just done it, ty. amazing!

[@shirokatake3285]

Did any of us had the videos side by side but on the wrong side of where each must be? Cuz I had Destin and Derek facing away from each other at the near end of the video that looked so weird xD

[@jordantcochran]

This synced video is amazing! Every cut and transition it’s just so smooth and clean that by the time you guys switch the screens in the last few seconds it’s like that was natural already.

[@elk3407]

HAHAHAHA!!! THEY SAID 2 MONITORS WAS A WASTE OF MONEY! THEY WERE WRONG!

[@mariusa5754]

Having 2 monitors is great but 3 monitors are better than 2...

[@elk3407]

Marius Ammann Oi, I'm just a high school student. A 3rd monitor is too expensive for the amount I would use it.

[@thefloof6163]

Same

[@Sajukhar]

Right? Watched both vids together

[@ramenchild5165]

IKR. lol

[@ZeroHBRPro]

This is so cool! The only problem is that I'll have to write this same comment in Veritasium's video.

[@DOMIN8RRR]

ZeroHBR I searched for this comment

[@Wintertot]

DOMIN8RRR I FOUND YOU BOTH

[@epicgiggles4553]

It's not the same comment because you switched the names.

[@veritasium]

ZeroHBR I came and found it here.

[@9000fail]

ZeroHBR And I had to like your comment twice

[@TS-cs2pe]

I just realized, Destin used “meter” and Derek used “foot”

[@Scotty-vs4lf]

ik that bugged me

[@derppickles1265]

yeah same thing with cyclone and hurricane

[@Paulthefonz]

it even weirder when you relize derek is canadian and destin is american

[@RootEntry]

@@Paulthefonz he knows the majority of people use meter 😎

[@Straza_Weeks]

WTF Its 2019 and I am only just watching this now!! my mind is blown. that was the best thing I have watched in years! thank God for two monitors. Off to Veritasium's page to post the same!! Im in the southern hemisphere!

[@hugoa.c.1566]

Straz Weeks same here

[@GpD79]

Wow... great collaboration guys. What's more impressive than this video? The fact that i got this video literally perfectly synced on the first try!!!!!

[@josiahpait5286]

True

[@firestar1056]

dude you should have posted the same comment at the other vid at the same time you posted this comment!

[@MaxBestawesome]

I saw ur post on the other vid exact same:)

[@GpD79]

+Max Best :-)

[@Misst004-x4t]

same hehe

[@justgiz]

Having dual monitors made this dual-video idea was amazing. And having it synced made it awesome. Thankfully I had SmarterEveryDay on the left and Veritasium on the right, so that outro was amazingly (is that a word?) kool

[@joejoe4games]

***** Same here, but i hade them on the wrong screen... :-(

[@steevf]

***** Same here!! Dual monitors on full-screen HD made it even better.

[@locohombre79]

Nice! I just had an iPad and iPhone, which worked fine, but you're setup must've been an awesome viewing experience!!

[@justgiz]

locohombre79 It was, here is a pic twitter.com/justgiz/status/606131408587726850

[@RobKinneySouthpaw]

***** I think the number of people correctly "guessing" which one to put left and right has less to do with random guessing and more to do with their setup. In both videos Destin's on the left and Derek's on the right, and they keep pointing in the appropriate direction when they mention the other guy's channel. I think they subliminally told everyone which side to put it on with good planning.

[@johnpombrio]

The speed of the earth spinning at the equator is 1,600 KPH. A meter is 1/10,000,00 of the distance between the North Pole and the equator. The kiddie pool is 2 meters across. So the difference in speed between the "North" end of the drain and the "South" end of the drain is 2/10,000,000 of about 1,000KPH (due to your latitude). That equals a speed difference between the north point and the south point as twenty centimeters (about 7 inches) PER HOUR. As my analog watch dial is 3cm in diameter, the speed which the hour hand moves around the dial is 10 cm per hour, a rough approximation of the speed of the one of the furthest points from the drain on the pool. The viscosity of water, Brownian motion, and how the drain was made (is it made by the manufacturer to spin?) would completely overwhelm any Coriolis effect that is this small. Even tornadoes are too small to have them spin in any particular direction. Hurricanes are much, much, much larger so the Coriolis effect does indeed make it spin counterclockwise in the Northern Hemisphere. The math first before the experiments begin can show how much trust you can put into the results you see. EDIT: the Wiki article about the Coriolis Effect had an example of a scientific experiment in 1908 that showed a statistically significant result of CCL draining of a 1.8 meter tub of water with initial conditions similar to what was done in this experiment but under "carefully controlled laboratory conditions", it took over 15 minutes before any rotation occurred, it was done many times, and the results averaged (which to me means that sometimes it did NOT go CCL). Was this experiment done under such exacting standards? I donno.

[@smartereveryday]

John Pombrio 7 inches per hour? Thanks for doing the math. This checks out. It took about an hour to drain. and the deflection observed was a little less than 7 inches. Awesome! Thanks for convincing me John!

[@johnpombrio]

SmarterEveryDay I am not trying to support your experiment, I am debunking it. The Coriolis effect is way too small to affect something as tiny as the wading pool unless all larger effects are removed. Since the water started to swirl (CL or CCL, it does not matter) almost immediately, the water around the drain itself would have moved less than a hundredth of a millimeter per hour east or west during the time that the initial swirl started. yes, tiny variations will cause the swirl to start in one direction or another but the CE is just so tiny. There is NOT ENOUGH SPEED caused by the Coriolis effect to determine the initial direction of the swirl unless all other possible larger effects are ruled out. Once it starts, and as long as the swirl continues in its initial direction, it DOES NOT MATTER what else happens (one hour to empty, two hours, who cares?) Other factors are way more likely to swamp such a microscopic movement. Your apparatus and environment a too crude to think of this as a valid scientific experiment. I can think of several flaws in your experiment. One is that you were lucky and the water spun CCL during your limited number of tries. The most likely one is how you designed the drain. The major problem was simply that your drain was way too large (it takes a lot of time for the tiny movement to affect the water swirl). If you used a flange that was not completely symmetrical (how the hole was drilled out could leave microscopic marks affecting the flow), the flow would be affected (does modern plumbing supplies deliberately swirl the water to aid in draining like they do in toilets?) Another is the bend in the PVC. Water flowing past may have been bent by the Bernoulli principle and sped up on one side, causing the water to swirl in a particular direction. Opening doors going into and out of the unheated garage could cause unwanted eddy currents. UNEVEN cooling of the water in the garage would certainly affect the results (sunshine through the garage doors during the day could do it). Ribs in the bottom of the wading pool may have been added to prevent slipping (are they in a spiral shape ?) or even tiny winkles of the plastic pool bottom and sides. Outside vibrations, air leaks in the garage doors and a subsequent breeze, how level the pool was all could add enough outside influences to get the water to swirl in one direction. Move the entire experiment in a deep cave. Use a huge ultrasmooth and dead flat tub. Create a drain that had its enter hole punched out and machined completely smooth VERTICALLY (rather than in a lathe). Have the water pour out directly onto the floor (no pipes). Add distilled water. Let it set for a month making sure that there are no thermoclines. Then run your experiment a hundred times. You still won't convince me but it will be much better attempt at eliminating other factors. www.scientificamerican.com/article/fact-or-fiction-south-of-equator-tornadoes-spin-in-opposite-direction/

[@pinkace]

John Pombrio But... it worked.

[@johnpombrio]

pinkace Not enough tries to make it statistically significant. And the setup was designed to prove the CCL spin. There were no other factors except the Coliolis effect mentioned which makes it fail the Baloney Detector Test: www.brainpickings.org/2014/01/03/baloney-detection-kit-carl-sagan/ I still think the drain plug is designed to swirl the water to make it drain faster (like the toilet jets mentioned in the video). I will have to go to Home Depot to see for myself how they design the things. Or perhaps the kiddie pool has a ribbed design (to prevent slipping) that affects the way the water flows. The math does not lie. EDIT never though about how the draining valve causing eddy currents that could affect the spin. Thanks for whoever mentioned this.

[@PyroMachinima]

Dibu Elniv What would they know about the correolis effect? Rocketscientists are not even in the same field of science and a doctor isnt even a scientist which goes to show your incompetence.

[@sonicclang]

I can't believe I'm just seeing this now. This is the coolest set of KZbin videos I've ever seen. Not only is the subject matter super geeky and right up my alley, but the execution of the synchronization is incredible! Well done.

[@zuludude2]

133,503 people watched this video without watching the other one :P

[@Sh0cKwavE__]

Alexander Krikorian I'm on mobile

[@the44thcosmic_galaxy25]

Ben Hoang you dint need two devices if you look at the time in witch smarter everyday stops talking in one clip watch the video then go to the other channel and you remember the time when you get their you will understand I am on mobile asswell I did it so should you =]

[@yofn1541]

not exactly. not all those who watched the other channel's video watched this one as well. not a very logical deduction.

[@huonglevan2276]

i watch this one first and didnt notice the sync thing(i usualy skip the first bit of every video so i watched this one twice)

[@thecrazeecow1682]

My toilet doen't swirl. It goes "GA WOOOOOOOOSH" like a jet straight down

[@thewolfin]

Ah, one of those Dyson Shitblade toilets

[@michaellundphotography]

Right?? I don't know why but its funny =)

[@befer]

idk why but the fact that i read it like some kind of tribal shaman just makes this comment so much better

[@jaysilverheals4445]

nobody is going to believe that

[@cseblivestreaming]

you on the north pole? are you santa?

[@bigbirb5233]

This Collaboration With 2 Monitors Were Amazing

[@daveelbarbaro3313]

I'm telling you, it is

[@Acorn_Anomaly]

Honestly, the most amazing part of this set of videos(to me) was the score editing. The music playing on both videos as you give your explanation sounds complete on both, but when you play both together, it sounds like one composition. It's amazing!

[@hawxonly]

I like that Destin said 1.5 meters in America and Derek said 5 feet in Australia

[@rabdownunder6775]

+Steven Wilke What American would no what a meter was? That's to measure voltage or something. Sorry!

[@Woshibairen]

+Rab Downunder A meter is a distance or whatever fancy thing its called, and I'm American and I know what a meter is.

[@whopperlover1772]

+Rab Downunder are you joking?

[@i26C]

Destin's a rocket scientist. AKA doesn't use imperial bullshit

[@cringelittleboyindenial3195]

lol

[@GreywardenRimu]

i liked the idea of syncing the two videos, this is one of the coolest videos i've ever watch :D

[@jawindyu89]

this was actually the best video(s) ever, and amen to the guy who said ''THEY SAID 2 MONITORS WAS A WASTE OF MONEY!''

[@fisheroldham7707]

I am on mobile so I couldn’t see it

[@squidwardo7074]

i mean you can watch both at the same time using the splitscreen feature in windows

[@Oogabooga-]

I got the music synced up perfectly.

[@eduardochavez82]

FU I tried for like 5 min but my phone sucks

[@NotMuchu]

1st try lol

[@somhairlemacdonlad7284]

Eduardo Chavez how were you planning on doing it with a phone

[@ryukdluffy]

Seth Ross same. Both videos started at 0.19 seconds.

[@dankydrankH20]

Somhairle MacDonlad one phone, one computer. Just like in the video...

[@ryPish]

*Protip*: You want Destin's video on the left and Derek's on the right. On windows: You can use the Windows key + left or right to move a window to the left or right side of your monitor(s).

[@jamster251]

Ry P I've been using windows 7 for 4 years and I'VE ONLY JUST FOUND THIS OUT!!! Thank you so much :D

[@ruolbu]

Ry P In the end they switched sides, so it does not work anymore, but yep I was positively surprised when it worked so well in the beginning :D

[@smartereveryday]

Ry P This is the right way to do this!

[@Huntracony]

Ry P or you can drag it to the edge of the screen on the side you want.

[@TDGalea]

Ry P Linux: CTRL + Win + Arrow

[@ZoggFromBetelgeuse]

This is pure genius.

[@MeqaAdeliuz]

Zogg from Betelgeuse you're still alive?

[@3128ben]

Zogg from Betelgeuse Where were u?

[@veritasium]

Navaneeth Rajan He was observing from above the Earth, so to Zogg from Betelgeuse the result seemed obvious since he is not moving with us in our rotating frame of reference

[@FireCalvinMaster]

Zogg, I still need information to conquer earth for the galactic beaurocracy

[@TheDrB0B]

Zogg from Betelgeuse I've been a loyal fan of you since your 3rd video. Pls come back :(

[@kelrune]

ok i know this is almost 5 years later. and i am just now seeing this. i loved this. It took me 7 tries to sync the video to be off by no more than about .5 seconds but i did it. Great work you two

[@CNETHome]

One of the greatest videos I've ever watched. Thank you for this!!

[@i3e5l4]

RizKnows Two* of the greatest videos you've ever watched, technically. ; )

[@InUterusLimbo]

moron

[@Zigguratxyz]

That synchronisation experiment was absolutely fantastic.

[@Kairinkai]

ikr

[@QuilloManar]

Why does SmarterEveryDay's video...

[@MrYosinof]

+Quillo Manar Because SmarterEveryDay ...

[@QuilloManar]

Josias D. Rodriguez But both of these videos are designed to be watched...

[@farn0153]

Yeah, but he...

[@dirigibility]

Probably because KZbin...

[@mannyt814]

+Quillo Manar nice uncut...

[@scottvarley3823]

I’ve had Veritasium’s video sitting at the top of my watch later list for about 5 years. Today I was floating around on KZbin trying to decide what to watch, and I looked at this video, saw my phone, and I decided today was the day (finally). The video was amazing! (Commenting on the other video too) (I’m already subscribed to both)

[@Gibbontake]

I really like...

[@nyarlotep]

Gibbontake it's like...

[@ceto1991]

Gibbontake i see

[@brylidan]

Gibbontake haha-

[@hommebizzare]

Gibbontake I was about to do the same thing...

[@Twitchi]

Gibbontake Dang it I was gonna do this :P

[@TheLast2nd]

Dual monitors just make this 100x better.

[@Braxan1337]

This video was so freaking cool! KZbin should add a feature which allows you to sync videos to promote cool stuff like this! The music was so perfect too! It didn't sound weird even if you synced it a second or two too late!

[@smartereveryday]

Elias Lundberg Watch it again!

[@Braxan1337]

SmarterEveryDay I've already watched a thousand times! :D

[@fearlessdigitaljourney]

Holy cow! BEST VIDEO EVER! This takes youtube to a whole new level. Having two monitors makes this experience truly mind-bending. Thank you Destin and Derek for masterminding this video sync!

[@dolfomachado12]

This was just unbelievable! I'm so proud of being a subscriber on both channels! Thank you Destin & Derek!

[@applepine1048]

LOL

[@berliandro]

Do you see my comment in the other side?

[@jeff74801]

Do you see mine?

[@berliandro]

+Jeffery Franklin I do LOL!

[@icuXD]

Is mine there?

[@berliandro]

+yperz there is lol

[@marcorodriguez7748]

what about mine?

[@gdean187]

The syncing of the two videos was pretty cool. Never seen anybody do that before.

[@ET2carbon]

There was actual beauty in this experiment. The world connected. I watched it first by itself and didn't make sense. With the sync oh my God insane! You did fantastic work here. Thank you for this excellent work.

[@iiiSidewalks]

this with dual monitors was amazing.

[@hwmmc4405]

+libaconil Seriously, this was really fun to watch this way.

[@ThugMuffinification]

Watching both videos at the same time was so cool! Never seen two videos synced like that before, I can only imagine the time it took to get it perfect like that. You guys are both amazing, so glad I'm subscribed to you both! The best of the best right here! 👍👏😆

[@Boryspitzanzx]

who else continued to watch both videos even after the sync was over???? chaos was it XD

[@Boryspitzanzx]

Boryspitzanzx and here

[@nayhem]

Boryspitzanzx They still kind of hit the same topics around the same time. Was hoping for a *psych!* moment.

[@AlexHeisEngholm]

Maybe it best to play the videos on two different devices...

[@DumbfoundedMadman]

Yeah, I'm 5 years late to the party, but I still felt the need to express my opinion on the fact that this was an awesome collaboration video and I'm glad it exists in the world.

[@BamaFanEdge]

Did anybody catch the metric joke? Destin has a 1 meter kiddie pool and Derek has a 5 foot kiddie pool.

[@BamaFanEdge]

KZbin's comment system is weird. I can't see any comments related to this. I think they show comments in a different order to different users.

[@kasperbennetsen6302]

1,5

[@devilmonkey427]

strange how Veritasium used the term 5' foot wide (in a metric country) and Smarter every day used 1.5 meter (in an imperial system country) as their units of measurement. This is why we crash space probes people! Just thought it was odd.

[@MakeSomething]

I never use this word but this collab was EPIC!

[@Kairinkai]

lol

[@KubaAirs]

I watch both channels regularly and I just realised that I am not subscribed to neither of them, fixed that! This was really cool video/project Destin and Derek, thanks!

[@groovylobster]

and finish writing the comment on this one?

[@Bentherabbit34]

The fact that the end on your comment is on the left video

[@qminer3]

groovylobster yes I think it does.

[@BigLeprichaun]

groovylobster Yes, I do believe it does.

[@BigLeprichaun]

groovylobster Yes, I do believe it does.

[@4560123678]

BenTheRabbit He should've thought about that...

[@teunissenstefan]

What if I told you that I put this video on the right, and I found out after the videos that this was supposed to be on the left side? lol Good work guys!

[@Racecar564]

Stefan Teunissen The same exact thing happened to me.

[@teunissenstefan]

Racecar564 rip us

[@VikingPickles]

+Stefan Teunissen me too :(

[@nuetral1zm]

+Stefan Teunissen I did the same thing ahaha

[@BatteryAcid1103]

It's a shame I'm limited to only one like per video.

[@althecomm]

Acid It's okay, there are two videos! :)

[@grampton]

Use 2 devices! I just did it

[@margaretbrennan4878]

Acid congrats top comment

[@jonm3024]

Thank you! So tired of people incorrectly telling me what direction my toilet flushes and then acting like they know better than me when i tell them they are wrong... I live in southern hemisphere btw...

[@jr52990]

I didn't realize I had the videos on the wrong side (r to L) untill the end of the video. haha But gosh was this incredible.

[@SeanSemanko]

***** Same!

[@samo5566]

***** *insert comment about how i did the same thing here*

[@SeanSemanko]

Hackeye lol, it's OK. :)

[@Nieumarlamalpa]

Having 2 monitors and syncing it nearly perfectly, it was an amazing! Even guessed which vid is the right and which is the left! 10/10 wold watch again! :D

[@KittyTacoProductions]

Had them PERFECT on my phone + Ipad and my mom called me...

[@AG.Floats]

Just go to the equator. It goes straight down right over 0.0.0 but changes direction each side.

[@Draktand01]

What happenes if you try this in the equator?

[@FTWGamerTrue]

Draktand01 Might as well divide by zero and exceed light speed.

[@veritasium]

Draktand01 FTWGamer No swirl!

[@st_us]

Veritasium prove it!

[@FTWGamerTrue]

Veritasium It isn't perfectly across just the equator. My comment was truth.

[@abraker]

Draktand01 I ask the same about hurricanes.

[@kaylaempson5788]

His face is so close to the toilet bowl that it is making me uncomfortable haha

[@demef758]

It's always amused me how guys can stick their faces in toilets and sewers when they need mechanical attention and the girls gag. Then the girls happily stick their faces in a babies soiled diapers and the guys gag. What's wrong with this picture?

[@exopxo5691]

at 1:34 GOT HIS A TOILET WATER SPLASH UP HIS FACE

[@WeTubule]

You don't have to be close to get "toilet plume" on your face.

[@Thevisualdude]

wow synced perfectly...amazing idea guys

[@smartereveryday]

TervellLive I give Derek credit for the idea!!

[@Thevisualdude]

You guys both were awesome!!...

[@thiago1385]

Hi, 8 years later my wife asked me about this effect bc of an x files episode, now I showed her this (both, simultaneously) videos What a journey I had with you guys in those almost 10 years... Love you guys! Ty for all!

[@CVshorey]

Great concept, great video, think you got the right answer for the setup you have, but . . . .to get a confident result that you both didn't just do a coin flip predicting one would get heads and one would get tails (25% chance is pretty good), you each need to run this experiment a minimum of 30 times to get a statistical handle on the consistency of the result. Then there's making a connection to the toilet bowls. In the formula for Coriolis sits velocity. If the velocity is zero, there is no Coriolis. The water in both the toilet bowl and your pools started at near enough to zero, but both get velocity as they move in toward the drain. Problem with the toilet is that there is too little time and distance to build that up to any significant degree. You rightly pointed out that it is more jet and bowl shape dependent. Your pool had time and enough distance to let that very small Coriolis that had built up with motion, to finally overcome (probably, we don't know until you run 29 more) the other forces possible. Was it deionized water with no magnetic fields? I know that would be small at best but an ionic gradient in a field could come near the Coriolis force involved here.

[@Marcotonio]

This video has around 500.000 more views than the other one. YOU HAD ONE JOB, PEOPLE!

[@Xomb1fy]

The fact that there are about 80,000 more views, that means there are probably 80,000 confused people.

[@chadkrause6574]

The video sync was really fun! At first I watched it without the sync and I was like “hmm a lot of dead air but okay” and then I remembered at the end it was supposed to be synced. Second time around made more sense. Good video!

[@Alex-mp4kl]

This was incredibly put together

[@edancoll3250]

Awesome video, Derin!

[@InterrobangActivate]

Do you mean Derk from Veristablium?

[@TasX]

No

[@JamesBartholomewMusic]

This is awesome!

[@XavierBetoN]

Incredible! I watched this video when it was first shot, but now being able to synchronize after 6 years and watch it again like that. It's wonderful, spectacular, bizarre, I'm speechless.

[@XavierBetoN]

Ps. Thanks to Opera pop-up video script, for making this doable on single monitor.

[@SmartDufus]

what if a hurricane were to travel over the equator..

[@irishdc9523]

Panvdlen would it have two eyes?

[@callummckie894]

That's why hurricanes in the tropics and close to the equator are so much more dangerous - they don't know which way to go.

[@timmallette1888]

They can't-never have.

[@caelanreeves9760]

Panvdlen inception

[@PapiJack]

Not sure... maybe that's why they naturally get pushed one way or another.

[@JohnWilson-dx8jk]

Ok, I’ve known about the corealis effect for some time but I do have a serious question. A sink draining or a hurricane swirling goes counter clockwise in the northern hemisphere and clockwise in the Southern Hemisphere. What would happen if we did this experiment ON the equator?

[@isaacpatman5255]

there isn't enough angular momentum for hurricanes or cyclones to form on the equator exactly so I presume it would be most likely chance, "Cyclones can't ever cross the equator. They occur mainly between 10 and 20 degrees north or south of the equator and are the product of tropical low pressure systems over warm water "

[@nellyfarnsworth7381]

On the exact equator line, water does NOT SWIRL. WATER GOES STRAIGHT DOWN.

[@asyouwish9567]

@@isaacpatman5255 There isn't enough angular momentum in a 4 foot pool either.

[@asyouwish9567]

@@nellyfarnsworth7381 No it really doesn't . It swirls like everywhere else.

[@nellyfarnsworth7381]

@@asyouwish9567 So sorry you WONG. I am salesman, travel much. Go to Equator line. Water No SWIRL, go straight down. People know this for thousands of years, before us.

[@Pegart]

Awesome job guys and already subscribed... PS: Go look for the second part of this comment on the other vid. ;)

[@Flagen579]

Pegart Found it!

[@Flagen579]

Pegart Wait. I've been here...

[@Flagen579]

Pegart Oh sh*t. I'm stuck in a loop!!!

[@Peteminator]

Pegart ...Liked these channels

[@Huntracony]

Pegart I don't take orders from you!

[@stonerbland256]

This was SO COOL you guys are UNREAL for doing this I've been a fan of veritasium for years I can't believe I never saw this

[@8BitUzz]

So what's the toilet swirl like exactly on the equator? :P

[@rrastetter]

***** Hurricanes travel away from the equator because of the Coriolis effect.. If you had a very large pool on the equator, I'd assume you'd get 2 swirls forming in opposite directions. I'm no fluid dynamics expert but I'm picturing a heart shape flow pattern with the 2 swirls shifted west of the drain and the outside of each spiral flowing back towards the drain hole. Someone go try it!

[@8BitUzz]

Richard Rastetter Sounds cool! Also since it'd be very near impossible to be exactly on the equator, I wonder if the swirl would have less force slightly north/south of the equator compared to being a fair distance away.

[@rrastetter]

East*

[@DimaGepard]

I think we should expect third video from the guys from the place somewhere near the equator.

[@mrchangcooler]

Jonathan Kubik Why not?

[@Nodularguy1]

I think they broke the internet

[@nayhem]

and left it to us to fix

[@wozzle68]

Wow! I was a bit late to the party, but what a cool collaboration. Thanks for the effort guys. :)

[@larryjohnson150]

It is so cool to have one video running on my tablet in the minimized view with the other playing my phone in full screen directly underneath it so they are one top of the other. Awesome videos!

[@sagewaterdragon]

Why did this not appear in my subscription feed?

[@TurkeyMeat]

Sage Water Dragon It does that sometimes, just wait a bit.

[@lucidexistance1]

Sage Water Dragon Same here, I'm subscribed to both, but only this one showed on my subscriptions. It's annoying that youtube kind of chooses what videos you get to see even though you're subscribed.

[@TurkeyMeat]

No believe me it will show up later, this one was just a lower priority because he has less subscribers I think. This one probably showed up for you first because you watch this channel more.

[@lucidexistance1]

Actually, I got confused and thought I was commenting on the other channel. And yeah, they eventually show up. But I end up missing a lot of videos because once I've viewed all the new videos (well.. not all) I stop looking further. CGP Grey found a solution to the problem by signing up to receive an e-mail whenever a new video is released.

[@TurkeyMeat]

Your gmail is linked to your youtube, and if you look in the "social" section it shows up.

[@kenea3226]

I wonder how the flat earthers feel about this/these videos?

[@Kmcornell23]

Well obviously it wouldn't be possible because the earth is flat. lol.

[@IAMSTEVIERAYBITCH]

Well anybody should question what really is going on here. If you believe in the Coriolis effect as Dustin is trying to make you believe then you must believe the Earth rotates underneath hot air balloons,planes, helicopters and drones that does not happen in real life now does it. Therefore Coriolis effect it's not the way Dustin thinks it is. I do not deny the Coriolis effect I deny it in the aspect Dustin is trying to portray it.

[@flatstuff1630]

Flat Earther here. We feel that if you can't understand toilet/sink/drain swirl, but are willing to hang all your beliefs and your image of the world on it based on what a video made by a cracked out nutcase says... Then you just might be a hopeless globetard.

[@CaptainGibbons]

@@flatstuff1630 I can tell you're really a flat earther because you didn't answer the question with anything but ad hominem lol.

[@flatstuff1630]

@@CaptainGibbons not gonna repeat what 1000s of others have already said. Ignorance of the truth is no excuse for not looking for it. Which clearly you haven't. Grow up

[@xorinzor]

this was so cool haha, loved the creativity!

[@billintulsa]

I am just now finding this video, and I indeed synched it up with Derek's. I have never seen an online demonstration like this, and the results are incredible. Well done.

[@NickSheridanVids]

Is the threading of the plughole and the direction in which the pipe flows the water not a variable?

[@wol377]

VidSheridan Yep... there's lots of variables not taken into account here. During the time lapse you can see a lot of movement on the surface of the water in the garage due to air currents. The side of the pool nearest the windows would be a different temperature than the other side causing thermal currents in the pool (vertical, yes, but the sides of the pool are not perfectly vertical so you get horizontal currents also) As small as these external factors may seem, they still outweigh the Coriolis effect. Consistent bias leading to consistent results.

[@NickSheridanVids]

Indeed. I'd be curious if the result had been negative, how would Destin and Vertiasium package have packaged it.. Would we get a "the coriolis effect isn't real!" or "the coriolis effect is inconclusive" or just scrap the whole project.

[@wol377]

VidSheridan The question isn't whether the effect is real, it's whether or not it's observable at these scales. The maths show the effect is extremely small at these scales and negligible when compared with resting water currents unless extreme measures are taken. That being said, if they had swapped pools, draining mechanisms and did it in a few other locations I would be more willing to believe this was the Coriolis effect in action.

[@NickSheridanVids]

Excellent point, I'd forgotten about the application to larger systems such as weather etc. Maybe they just needed two much much bigger paddling pools ;)

[@swng314]

wol377 They said they bought the same pool. Do the random variations during the manufacturing process affect the draining system that much?

[@lolscience1979]

Who was subscribed to both before this video?

[@TULINIUMGAMES]

Awsome Double video experience! The timing can't have been easy! =) Great job! and fun to learn

[@Sherlock_MacGyver]

Simple editing lol

[@Xilibrius]

Just found these videos randomly when creating a puzzle for pathfinder and this is so cool how they sync up. great job!

[@bubu_2347]

TOP 10 hardest Video to Watch Ever

[@atdfbttl15]

Just git gud and get 2 monitors

[@atdfbttl15]

Just stop being so poor

[@EvertBorghgraef]

Ok Destin, awesome video, BUT: I had the Veritasium video on the left, and yours on the right, which in the beginning made sense, as it looked like you walked from his screen to yours. In the end though, it was all swapped around! Those are some continuity errors Destin, don't let me catch you on one again.

[@smartereveryday]

Evert Borghgraef Rewatch it!

[@veritasium]

Evert Borghgraef Listen to SmarterEveryDay

[@soccerguy2433]

Evert Borghgraef it works with SME on the left, Veritasium on the right

[@EvertBorghgraef]

SmarterEveryDay​ Veritasium​ I figure I'll watch it again then! I loved this one by the way, are there more collaborations following?

[@BlueBetaPro]

This was Awesome. (This is a twin comment)

[@dogztooth]

BlueBetaPro BlueBetaPro i am replying to both the same

[@DaRkLoRdZoRc]

BlueBetaPro Sup.

[@untitledname5183]

dogztooth xD

[@NayroTheAdventurer]

Shaibah That double vision gets the best of me

[@LoalaCai]

This was a very cool video.

[@emptysora_]

Another fun part about the Coriolis effect on hurricanes is that hurricanes cannot cross the equator without being ripped apart by the Coriolis effect. It’s actually pretty cool, since the Coriolis effect effectively repels hurricanes from the equator, when you look at a map of all the recorded hurricanes in the past 30 or so years, you’ll notice, none of them *EVER* cross a particular latitude. There’s like 10 or so degrees around the equator where no hurricanes have touched.

[@TheNdoki]

There seems like a lot of variables that could induce "vorticity" I mean, what about minute variances in the surface of the pool? Or putting the drops of dye in? Or if the pool isn't perfectly level? I dunno, with something so precise it seems like there could be a lot of variables unaccounted for.

[@RickRaulston]

+Ndoki Hasaki How do you know that the opening of the valve didn't affect the flow pattern? It would have to unless it opened from the exact center. This is not the case with a ball valve which relies on a twisting fashion which would create a bias in one direction or another for the initial inertia of the water to begin a circular rotation.

[@TheNdoki]

Rick Raulston Exactly my point.

[@TheOriginaMurrinator]

+Rick Raulston If they used the same valve then repeated again with a valve that twists the other way and see if there was any change you could be pretty certain

[@BCFalls1]

+Ndoki Hasaki being outside, wind can play a factor and coriolis effect has to do with air not direct gravitational pull. Inside a warehouse as a controlled environment is the ideal place. Also, direct flow with no valves must happen to not limit the drop.

[@daniricard1]

this has been disproven, the direction depends on the nature of the drain itself.

[@TurkeyMeat]

+Danielle Ricard They used exactly the same pool though, so the drain is theoretically the same...

[@funknjam]

Your point is well taken. Veritasium pulls a plug to drain. Smarter Every Day turns a valve to drain. The dropping of the food coloring was inconsistent (and ultimately unnecessary). Doing real science requires controlling every variable possible and there were many here that were obviously not controlled which gives one reason to call the entire "experiment" into question. To see the CE arising from Earth's rotation, one would need to see an appreciable latitudinal speed difference from one side of the system to the other. That's non-existent at the scale of less than 2m. Beyond experimental design, the explanation of hurricanes is either grossly oversimplified to the point of being incorrect or just incorrect. I recommend anyone interested read up on cyclonic circulation. The rotation of a cyclone stems indirectly from the CE, not directly from it.

[@mindyaguliar9346]

Danielle Ricard ...im pretty sure they mentioned this.

[@mb4lunch]

Precisely.

[@miguelcabral9463]

I watched each video one at a time and it was the most awkward thing I’ve ever experienced

[@Angarsk100]

Even though I found this gem 6 years later, joke's on you guys! I'm already subscribed to both of you... To me, 2 of the top 5 channels in Yt.

[@NofewFudtefcity]

That globe was wonderful. I'm so happy I went into this blind and just decided to actually sync things. Everything was done so well!