Hand vs. Eye
Magician turned mathematician Persi Diaconis is giving a talk in Berkeley tomorrow. I saw him give a talk in Chicago a couple years ago, where he discussed how many times one needs to shuffle a deck of cards to make it random. He’s also created experiments to test whether a coin toss is ever fair. As a magician, Diaconis can pretend to shuffle a deck of cards or get a coin to land the way he wants and convince you he had nothing up his sleeve. Sometimes even an amateur can trick your eyes into believing something false.