What Urinal Cakes Are Made of and Why People Should Not Eat Them

SciShow host Michael Aranda explains exactly what urinal cakes are made of and why people should not eat them, as if anyone needed reasons not to eat them.

If you happen to be a frequenter of urinals, odds are you’ve seen one that has a little block at the bottom of it. But what does it do and why are you peeing on it?!