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nationalgeographic.org
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TIL Aristotle was Alexander the Great's private tutor and from his teachings developed a love of science, particularly of medicine and botany. Alexander included botanists and scientists in his army to study the many lands he conquered.
XENeX
TIL There is enough stone in the Great Pyramid of Giza to build a 3 meter (9 foot) wall around France
D1yGY
TIL That the Arctic Tern fly over 18,000 miles every year in their quest for eternal sunlight. Thanks to their light weight they can glide for extended periods of time on the ocean even sleeping and eating while gliding.