This coin fact may seem unlikely but it is scientifically proven to be true: The chance of a coin coming up as started is 51%, more than half. Meaning, if you flip a coin starting with heads up, there is a 51% chance the the coin-toss result is heads up. This was proven by Stanford professor Persi Dianconis. Source: Dynamical bias in the coin toss.

More people start a coin toss with heads facing up, compared to tails. Therefore, heads is a more likely outcome than tails in a coin toss up.