: 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.
: The Turritopsis dohrnii is a species of jellyfish that can theoretically live forever by reverting to its juvenile polyp stage after reaching maturity. Hard To Believe
: Human stomach acid is strong enough to dissolve a single-edged razor blade in about two hours. : While the Great Pyramids were being built
: In a 22-year window (1843–1865), it was theoretically possible for a Japanese samurai to send a fax to Abraham Lincoln . Hard To Believe
: Cleopatra lived closer to the invention of the iPhone and the first moon landing than she did to the construction of the Great Pyramids.