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The history, math and science behind leap years

Every four years, we have to squeeze an extra leap day into February. Except we don't add an extra day every four years if that year is evenly divisible by 100, unless it is also evenly divisible by 400. If that sounds confusing, well, it is. Jamie Wax dug into what leap years are all about -- and started with one special leap day birthday girl.
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