UNITED STATES -- Many Americans will celebrate the Fourth of July holiday with backyard BBQs, picnics or a trip to the beach. But did you know that Independence Day was not a paid federal holiday until 1938, Congress changed it? (source: ACEI-Global). 

1. Thomas Jefferson was not the only author of The Declaration of Independence
While Thomas Jefferson is often called the “author” of the Declaration of Independence, it was not a solo project. Jefferson was a member of a five-person committee appointed by the Continental Congress to write the Declaration that also included Benjamin Franklin, John Adams, Robert Livingston, and Roger Sherman. (Source: ConstutionFacts.com)

2. George Washington did not sign The Declaration of Independence
The Declaration of Independence was signed by 56 men from 13 colonies, but George Washington was not one of them. On July 4, 1776, the Continental Congress formally adopted the Declaration, Washington did not sign it because he was in New York preparing to defend Manhattan against the British. (Source: Harvard.edu)

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3. The average age of the signers of the Declaration of Independence was 45
The youngest was Thomas Lynch, Jr (27) of South Carolina. The oldest delegate was Benjamin Franklin (70) of Pennsylvania. (Source: ACEI-Global)

4. Only two signers of the Declaration of Independence later served as President of the United States
John Adams and Thomas Jefferson, who did much of the writing of the document, were the only two signers to go on to be President. (Source: Grand Valley State University)

5. Many Founding Fathers did not sign the Declaration of Independence until August 2
On July 4, Congress officially adopted the Declaration of Independence, and as a result the date is celebrated as Independence Day. Nearly a month would pass before the actual signing of the document took place on Aug. 2. (Source: History.com)

6. Thomas Jefferson and John Adams both died on the Fourth of July
Two of the architects of the Declaration of Indepence -- and the only two to become President -- both died on the document's 50th anniversary on July 4, 1826. (Source: History.com)

7. The first fireworks to celebrate the Fourth of July occurred the following year
Fireworks have been part of the national celebration since 1777, when fireworks were set off in Philadelphia. (Source: Slate.com)

8. The Liberty Bell no longer rings
The Liberty Bell cracked beyond repair on Feb. 23, 1846, and the bell's clapper has been immobilized since 1915. Although the bell can't ring with the clapper, it has been struck with a mallet and the sound recorded. (Source: National Parks Service)

9. The tune of the National Anthem is actually from an English drinking song
While Francis Scott Key wrote the lyrics to the Star Spangled Banner, the tune comes from an English drinking song called “Anacreon in Heaven.” (Source: ACEI-Global)

10. More than 14,000 fireworks displays light up U.S. skies each Fourth of July
The American Pyrotechnics Association (APA) estimates that more than 14,000 fireworks displays light up U.S. skies each Fourth of July. (Source: National Geographic)