This month Mental Floss is releasing our brand new book, The Mental Floss History of the United States. (In fact, if you pre-order the book before October 5th, we’ll give you 3 free issues of the magazine!)


In our hunt for great history, we can’t stop spouting facts, including:


- Growing up, George Washington celebrated his birthdate as February 11, 1733. But when British colonies adopted the Gregorian calendar in 1752, his birthdate was recalculated to the 22nd.


- Until coffee gained popularity, beer was the breakfast beverage of choice in most urban areas of the United States. (Not that we’re endorsing that!)


- Woodrow Wilson never owned a dog, but he and his wife kept a flock of White House sheep as pets... and natural lawn mowers.


But we’re guessing you’ve got an even better fact up your sleeve, and we’ve got $1000 to prove it. This month, mental_floss is giving away ten $100 shopping sprees to the geniuses who send in America’s Greatest Facts.

All you have to do is share one fact on the simple form here. (Note: only facts submitted through the form will be considered.) But remember, one entry per person! Contest ends October 15th, so be sure to get your entry in quick.