"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Stay sharp and learn something new every day or stock up on knowledge for the next 105 days with these ...

Impress your kids with fun facts that are both age-appropriate and surprising. Did you know that ketchup was once sold as medicine in the 1800s, or that Earth has more trees than stars in our galaxy?

There’s a reason fun facts are called fun facts. It’s always entertaining to discover a new and interesting or shocking piece of trivia to share with your friends, family, partner, the mailperson, ...