Hard To: Believe

: France was still using the guillotine for executions as late as 1977—the same year the original Star Wars was released in theaters. Bizarre Science & Nature Facts

: The Turritopsis dohrnii is a species of jellyfish that can theoretically live forever by reverting to its juvenile polyp stage after reaching maturity.

: While the Great Pyramids were being built in Egypt, woolly mammoths were still roaming the earth on Wrangel Island; they didn't go extinct until about 4,000 years ago. Hard To Believe

: Human stomach acid is strong enough to dissolve a single-edged razor blade in about two hours.

: An average white, puffy cumulus cloud can weigh over one million tons—roughly the weight of 200,000 elephants. Impossible Survival & Human Oddities 17 Wild And Hard-To-Believe True Facts - BuzzFeed : France was still using the guillotine for

: Cleopatra lived closer to the invention of the iPhone and the first moon landing than she did to the construction of the Great Pyramids.

: On Jupiter and Saturn, the intense pressure and heat in the atmosphere can squeeze carbon into diamonds, which then literally rain down toward the planet's core. : Human stomach acid is strong enough to

: Sharks have been on Earth for over 400 million years, meaning they are older than trees and even the North Star.