At some point in history, every single person ends up in one of two categories: either they’re the ancestor of everyone alive today… or of absolutely no one. Sounds unbelievable? It is — and yet it’s true.

In this video from MinuteEarth, host Cameron Duke walks us through a mind-bending genealogy paradox that shows how, thanks to the way family trees overlap, there’s a point in time where your lineage either goes extinct or becomes universal. And the really wild part? That point in history may only be 2,000 to 3,500 years ago.

Check out the video and prepare yourself to see humanity’s family tree in a whole new light.