Leap Day is one of the rarest days - it shows up on our calendars only every four years. Imagine what that does to your birthday celebrations - if you were born on February 29 you'd only have a birthday every four years! But why is this rare date attached to science? First check out the Science Museum of Virginia's blog at http://sciencemuseumofvirginia.blogspot.com/2012/02/question-your-world-leap-day-science.html. Here you discover math and astronomy have the answers to your questions about this day that appears, then disappears with predictable regularity. So sit back, find out about this rare day - and then celebrate it's unique contribution to your life. Yes - it's really good to question your world!