To Believe | Hard

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

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

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

: In a 22-year window (1843–1865), it was theoretically possible for a Japanese samurai to send a fax to Abraham Lincoln . : The Turritopsis dohrnii is a species of

: Oxford University was established in 1096, making it older than the Aztec Empire, which began with the founding of Tenochtitlan in 1325.

: 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. : France was still using the guillotine for

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