Test your knowledge - How Much Do You Know About February 29?

Happy Leap Year! People around the world are celebrating today's leap day as an extra day in the year - or another day at work, if you're a cynic.

But how much do you actually know about leap years?

February was the one month in the Gregorian calendar which lost out - all thanks toEmperor Augustus' ego - leaving it with less days than the others.

The month did initially have 30 days, but Augustus stole two of them to add to "his" month of August.

The extra day is now added to February to adjust for the fact that the Earth does not take exactly 365 days to orbit the sun.