Once every four years, an extra day is added to the month of February. That year is considered a leap year, and February 29 is known as a leap day. Leap years exist because it takes the Earth 365 days ...
It's not every year that you see February 29 on the calendar -- and it's not technically every four years either. Thursday is officially leap day. For some, its birthdate, or a day for special deals ...
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