NPR's Ailsa Chang speaks to mathematician Eugenia Cheng about the Pascaline -- a 17th-century invention credited as the first mechanical calculator.

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Money blog: Interest rate held; ESTA prices rising; supermarket fights to stay in top five Today in Money, we cover the Bank of England's decision to hold the interest rate at 4%, a rise in the price ...

Disposable batteries seem so 1990s. Sure, it’s nice to be able to spend a couple of bucks at the drugstore and get a flashlight or TV remote back in the game, but when the device is a daily ...