It’s an age old question, does water in a toilet swirl in the opposite direction depending on whether you find yourself north or south of the hemisphere? Well, two YouTube channels endeavored to show us whether this was indeed myth or fact.

Watch the two videos below at the same time, to see their findings. We recommend opening the videos in two different browser tabs if they don’t fit in your screen, and playing them alongside each other.

Video credits: SmarterEveryDay and Veritasium

Video 1: SmarterEveryDay

Video 2: Veritasium