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I do string games in schools a lot, and kids often ask me if I do magic. I say no, these are tricks, there's only one piece of real magic that I've encountered in my 68 years: cutting a Moebius strip in half down its middle. The visible demonstration that you can cut something into two pieces but end up with one longer thing instead of two halves is astounding, and truly magical. It's also a crucial part of the most interesting area of mathematics, topology.