My mother sent me a link to Arthur Benjamin: Lightning calculation and other "Mathemagic" which shows Dr. Arthur Benjamin doing some amazing math. The link is to a video. I am totally amazed.
I've requested his book Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks from our library. I'm surprised that everyone one of the nine reviews on Amazon gave the book five starts. We may soon be buying the book.
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