Swimming: 8 facts – trivial and not – from 'Swim'

From author and journalist Lynn Sherr's new book 'Swim,' here are 8 facts about the history of humans in the water

4. Getting faster

Czarek Sokolowski/STF/AP

Swimmers, who frequently rely on fractions of a second to win a race, have figured out several things about water that make for a slower or faster time. Swimming through deep water is faster than shallow and wider lanes create water that's calm, which is also good for speed.

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