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A mathemagician races a team of calculators to figure out 3-digit squares, solves another massive mental equation and guesses a few birthdays.
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How does Arthur Benjamin do it? He'll tell you!
From the TED Conference, where the world's leading thinkers and doers are invited to give the talk of their lives in 18 minutes.
TED stands for Technology, Entertainment, and Design, and TEDTalks cover these topics as well as science, business, politics and the arts.
