What happens when black holes collide? | EXPERT ANSWERS PHYSICS GIRL QUESTIONS

I wish this guy was somehow in my life... even as a neighbor. There's so few intelligent ppl in the world, I feel like this guy could school me on so much stuff in which I'm near oblivious to. This video alone, I feel like I need to re-watch it at least one more time to fully grasp all the information given.

Something that wasn't mentioned here that I've always wondered about:  If a black hole has nothing left to feed on, will it shrink and eventually disappear after a period of time?