Did you know a “jiffy” is a real unit of time? It just means something different to an electrician, an animator and a physicist. In this Betcha Didn’t Know, we look at how people have kept time, from ancient sundials (and the odd word “widdershins”) to the Salisbury Cathedral Clock, which has been ticking for nearly 600 years. Along the way you’ll meet a $6.8 million royal clock, a collector who owns more than 1,700 clocks, and an atomic clock so precise it won’t gain or lose a second in 100 million years.
Exploring Time’s Tiniest Units
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