science

Yeah, I could time the flips and almost 9 times out of 10 "guess" which side it was going to be. I'm not going to lie and say that I didn't game the absolute fuck out of that ability as a kid. We played street sports all the time, so it was pretty handy.

Flip such that the maximum rotation is achieved, height should be a natural arc a few feet high, then with open palm, strike down at the coin like your smashing a fly on a tabletop, and snatch it out of the air.

My buddy Julian taught me this 40 years ago... Doing it right now and I can still make it come heads every time. Why though?

Well, you basically determined the number of turns the coin took.