Destin

"SmarterEveryDay" host Destin explaining his toilet swirl experiment. (Courtesy SmarterEveryDay)

Does water really flush in opposite directions depending on where you are in the world? People have said it's true, and people have said it's not. Where's science when you need it?

Two of YouTube's best and best-known science channels - Alabama's SmarterVeryDay with Destin and Australia's Veritasium with Derek - have a new and an ingenious experiment to see which way the water really goes in the northern and southern hemispheres. They say PBS, BBC, Scishow and even Ewen McGregor have gotten it wrong.

Synchronize the two videos below and then watch the cool jumps between Huntsville, Ala., and Sydney, Australia. You'll learn - once and for all - if swirls really do go in different directions.

If you're watching this on a mobile phone, save this address (http://www.smartereveryday.com/toiletswirl) for watching on a larger device.