The Truth About Toilet Swirl – Northern Hemisphere

The Truth About Toilet Swirl – Northern Hemisphere

Both videos on one page (for desktop):
Subscribe to Veritasium:
↓↓↓↓↓↓↓More info Below ↓↓↓↓↓↓↓

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.

Smarter Every Day Instagram:
Patreon Support Link:

Veritasium on Instagram:
Patreon Support Link:

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.


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:

The Coriolis Effect influences the flight of a bullet.

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:

Warm Regards,


You may also like...

19 Responses

  1. Bruno Zub says:

    Bro, That’s was really nice!!

  2. ShifaqKarim7 says:


  3. Anthony Liekens says:

    Follow the instructions in this video and watch both Youtube videos in

  4. orinokonx01 says:

    Well done guys! Subscribed!!

  5. Ibtihaj Khan says:

    This is fanstastic oh my god! well done guys!

  6. Feraloidies says:

    YUS! So proud of finally synching it, lol.

    This fantastic. I am going to send it to all my global friends.

  7. Kevin Small says:

    Awesome collaboration guys !!!! This comment is also synchronized lollol

  8. DocKobryn says:

    LOVED the synchronized viewing! Absolutely cool!
    And yes… I’ve now subscribed to your channel Destin!

  9. coolbeans2go says:

    That was amazing!!! I got it to sink up first try and I loved how when one
    of you stopped talking in one video the other started. This was the most
    innovative project I’ve seen in a long time. Keep up the great work guys!

  10. Marco Arcos says:

    this was amazing

  11. Kirk Ford says:

    Great job guys. Seriously. I’m not a YouTube commenter. I’ve been
    subscribed to both of you for a long time now. Fantastic experiment,
    fantastic sync. I loved every Minute…physics?

  12. EnderWaterBender says:

    This was beautiful! I love both of your channels so much and it delighted
    me to see this collaboration. Quality with a capital ‘Q’!

  13. Sploucht says:

    california cant do this very often

  14. Tasos Kozi says:

    This was incredibly cool! I’m nerding my brains out right now!

  15. Pugsley says:

    This video was fantastic. It’s great to see two of my favourite youtubers
    work together in such a cool way :D

  16. Luc Lessard says:

    This was awesome guys

  17. Zak El Fassi (Zakelfassi) says:

    Double monitors FTW!

  18. osphere says:

    this was freakin’ awesome

  19. Phil Latio says:

    synced first try like a boss