Mental Floss wants you to celebrate the Fourth of July by learning some FLOTUS trivia.
Imagine the people you can impress at your barbecue with "46 Facts About The First Ladies" (above).
You can start with the dirty laundry: Abigail Adams used the East Room to hang hers, according to the video. Bess Truman sent hers to Kansas City.
Then move on to the juicier stuff, like Mary Todd Lincoln's shopaholism and Nancy Reagan's penchant for astrology.
Now you know your history and your gossip -- like a true American. Here's hoping 100 years from now, we'll be able to read up on a few First Gentlemen.