I knew a girl born on Leap Day. She dressed up like a toddler and walked around high school on her 4th birthday. It was kind of annoying.
From http://www.holidayinsights.com/other/leapday.htm:
Leap Day is every fours years....almost. It's every four years except years ending with "00" that are not divisible by 400. The year in which Leap Day occurs, is called a Leap Year.
Why the fancy calculation? The earth rotates around the sun once every 365 and about 1/4 days. So, by adding an extra day every four years, we get mighty close to keeping the calendar consistent with the earth's annual trip around the sun. And to be very precise......
Sorry about that!
Happy Leap Day!