It's really embarrassing how many sleepless nights I've had due to my brain synapsing and wondering whether the chicken or the egg came first. I flip, I flop, I twist, I turn -- it's definitely a good brain exercise. But after watching ASAP Science definitively answer the question of which came first -- the chicken or the egg -- I can now sleep in peace.
Spoiler: it has something to do with dogs and wolves. Real spoiler: it's the egg. Disagree? Watch the video. [ASAP Science]