For nearly 150 years, experts have been trying to figure out why our post-asparagus pee smells so decidedly rancid. It should be a simple question to answer, right? Wrong. Turns out, part of the complication has to do not with the smell of asparagus pee itself — but with the smeller. Thankfully, Hank Green of Sci Show is here to explain it to us in a 4-minute and 30-second video — which I must say is 3 minutes too long. But since our civilization has been waiting for so many decades for the answer, I’m willing to sit through it. Mystery solved. (Photo courtesy of Buona Poppa).