Today is Presidents' Day, a holiday that began as a tribute to the first U.S. president, George Washington. In fact, in some places it is still called Washington's Birthday, and that is the official name still recognized by the federal government.
The day became a government holiday in 1885. It was celebrated on Feb. 22, which is Washington's actual birthday.
In 1971, the holiday was moved to the third Monday in February. Though it's still officially Washington's Birthday, the day has become known as Presidents' Day to recognize both Washington and Lincoln.
Of course, we don't need a holiday to remind us of the accomplishments of those giants of American history. But what about the other presidents? Barack Obama is the 44th president of the United States (though he is the 43rd man to be president, because Grover Cleveland was the 22nd and 24th). That's a lot of names to remember.