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.<p>1. Flip the coin twice<p>2. If you get the same result both times, goto 1<p>3. Now that you have different results for your pair of flips, use the first element of the pair of flips as your result.<p><a href="https://en.wikipedia.org/wiki/Fair_coin#Fair_results_from_a_biased_coin" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/Fair_coin#Fair_results_from_a_...</a>