- Oct 16, 1999
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Leap years are every four years EXCEPT when that fourth year falls on an even century that is not divisible by 400. So for example, 1996, 2000, and 2004 are all leap years, but 1900 is not a leap year even though 1896 and 1904 are. Now I've been on this planet for 25 years and never knew this before tonight, so come on folks, make me feel better and post in here that this is news to you as well.