Randommess Made Easy

I read something really cool in _Ph actum, the newsletter of the Philadelphia Association for Critical Thinking. If you've ever flipped a coin to make a purposely random choice, but worried that the coin might not be fair, use this trick: for each binary choice you have to make, flip the coin twice. If it comes up the same way both times, disregard and flip twice again. If it doesn't come up the same way both times, just use the result of the first flip.