Book Looks at Inventors and Obscure Geniuses Historian Harold Evans talks about great inventions by Americans. Evans' book, They Made America, profiles well-known inventors, and some obscure geniuses — the inventors of the gas mask, the credit rating and the retail franchise. Hear Evans and NPR's Steve Inskeep.

Book Looks at Inventors and Obscure Geniuses

Book Looks at Inventors and Obscure Geniuses

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Historian Harold Evans talks about great inventions by Americans. Evans' book, They Made America, profiles well-known inventors, and some obscure geniuses — the inventors of the gas mask, the credit rating and the retail franchise. Hear Evans and NPR's Steve Inskeep.

A portrait of John Fitch, who invented the steamboat toward the end of the 18th century. Bettmann/Corbis hide caption

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Bettmann/Corbis

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