**If the coin is tossed and caught**, it has about a 51% chance of landing on the same face it was launched. (If it starts out as heads, there's a 51% chance it will end as heads).**If the coin is spun, rather than tossed**, it can have a much-larger-than-50% chance of ending with the heavier side down. Spun coins can exhibit "huge bias" (some spun coins will fall tails-up 80% of the time).**If the coin is tossed and allowed to clatter to the floor**, this probably adds randomness.**If the coin is tossed and allowed to clatter to the floor where it**, as will sometimes happen, the above spinning bias probably comes into play.*spins***A coin will land on its edge around 1 in 6000 throws**, creating a flipistic singularity.**The same initial coin-flipping conditions produce the same coin flip result**. That is, there's a certain amount of determinism to the coin flip.**A more robust coin toss (more revolutions) decreases the bias**.

http://www-stat.stanford.edu/~susan/papers/headswithJ.pdf

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