2016 is a leap year which means that February will have 29 days this year. You may have students wondering why there is an extra day added to the calendar this year. You may also find yourself explaining, as I did one year, that leap year doesn't mean they go to school for an extra day. Should you find yourself in that position, the following two videos could be helpful to you. The first video addresses the history and evolution of calendars. The second video deals purely with the mathematics of leap year.