This cache has been placed in honour of my grandfather, John Charles, who was born on the 29th February. Babies born on this day have been referred to as Leapers, Leapsters, and Leap Day babies. The odds of being born on February 29th are 1 in 1,461, or .068 per cent, which makes them a real minority. Perhaps the most famous name with a February 29 birthday isn't even real — though it makes sense that he'd be born on such a special day: Superman.