19. The largest known prime number contains 41,024,320 digits. 20. Frogs breathe and drink through their skin. 21. A bullet fired from a 223 Remington leaves the weapon at up to 2,727 mph (4,390 km/h) ...

"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 ...

Even if you weren’t someone who got excited about science class in school, now—as an adult—it’s hard not to be amazed by science facts. Seriously, just stop for a minute and think about what both the ...