I set up a large marble run. Then, while perched on a stool, I pour pee into the funnel's top and watch it cascade down ladders, falls, and funnels until it lands in a glass, which I then drink. I set up a large marble run. Then, while perched on a stool, I pour pee into the funnel's top and watch it cascade down ladders, falls, and funnels until it lands in a glass, which I then drink.
