20150306_ted_02.mp3?orgId=1&topicId=1136&p=57&story=388518850&t=progseg&e=388518439&seg=2&ft=nprml&f=388518850

Part 2 of the TED Radio Hour episode Solve for X

About Terry Moore's TED Talk

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Polymath Terry Moore wondered why "X" is the universal unknown in algebra. He dove into the history of numbers to come up with an unexpected answer.

About Terry Moore

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