› added 9 months ago

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TIL the universe is mostly hydrogen (74%) and helium (24%). All other matter is part of the remaining 2% of stuff in the universe. The sum total of this matter accounts for less than 5% of the universe’s energy.

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v190R TIL the US government preformed radiation tests on unknowing US citizens in the 1940's and 50's. Victims included patients visiting hospitals for various reasons, prisoners, pregnant women, and mentally disabled children.
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p8gve 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.