Clock
There\u2019s no such thing as \u201cthe correct time\u201d. Like the value of money, it\u2019s a convention that derives its usefulness from the widespread acceptance of others. But there is such a thing as accurate timekeeping. That dates from 1656, and a Dutchman named Christiaan Huygens. In the centuries since, as Tim Harford explains, the clock has become utterly essential to almost every area of the modern economy.
Producer: Ben Crighton\nEditors: Richard Knight and Richard Vadon
(Image: A wall clock. Credit: Shutterstock)