Fair coins tend to land on the same side they started
Von Neumann described a very elegant way to get fair results from a biased coin.1. Flip the coin twice2. If you get the same result both times, goto 13. Now that you have different results for your pair of flips, use the first element of the pair of flips as your result.https://en.wikipedia.org/wiki/Fair_coin#Fair_results_from_a_...