The odds of a spinning penny landing on tails is 80%
Here's a neat trick if you wanna make easy cash next time: Bet on a spinning penny landing on tales most of the time. The reason for this is very simple: The side with Lincoln's head is just a little bit heavier than the tails side, causing the coin's center of mass to tilt a bit towards heads. It will tend to fall on top of the head 80% of the time.
If you remember, we also mentioned before that the odds of a coin flip aren't even either. However, you might not want to put that much money on that one, as the odds are 51/49 in favor of whatever side was up when the coin was thrown in the air.