Marie Curie's notebooks are still so radioactive they're kept in lead-lined boxes and require signed waivers to view.
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In 1971, a hijacker known as D.B. Cooper parachuted from a plane and was never conclusively identified.
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The Roswell incident sparked decades of extraterrestrial speculation.
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Some early mammals coexisted with dinosaurs.
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The Triassic period marked the first appearance of dinosaurs.
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In 1958, a nuclear bomb was accidentally lost off the coast of Georgia.
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Dinosaurs ruled the land for over 160 million years.
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The Tuskegee experiment became a landmark case in medical ethics reform.
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Prehistoric cave paintings provide insight into early humans.
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