How afften does a leap year occer?

Answer 1

A leap year occurs every four years. The exception is that there is no leap year at the turn of the century. The exception to the exception is that there is a leap year every fourth century.

The next leap year will be in 2012 (which the Mayan's predicted will be the end of the world).

Also, the Olympic Games take place every fourth year, e.g. 2008 Beijing and 2010 London.