Your year is about to get one day longer. Monday, Feb. 29 is leap day, the day inserted into the calendar every four years to keep our calendar operating smoothly. This extra day makes the year 366 days long, instead of 365 days like regular years.
Leap year traditions: It's acceptable for a woman to propose to a man on Feb. 29. The custom has been attributed to St. Bridget, who is said to have complained to St. Patrick about women having to wait for men to propose marriage. Patrick supposedly gave women one day to propose.
Leap year babies: People born on leap day are often called "leaplings" or "leapers." Most of them celebrate their birthday on Feb. 28 or March 1 on non-leap years.
Famous leapers: If you were born on leap day, you share a birthday with composer Gioacchino Rossini, motivational speaker Tony Robbins, jazz musician Jimmy Dorsey, actors Dennis Farina and Antonio Sabato Jr., and rapper/actor Ja Rule.
Leap years in history: During leap years, George Armstrong Custer fought the Battle of the Little Bighorn (1876), the Titanic sank (1912), Benjamin Franklin proved that lightning is electricity (1752) and and gold was discovered in California (1848).
There's a leap year club: The Honor Society of Leap Year Babies is a club for people born on Feb. 29. More than 10,000 people worldwide are members.