› added 12 years ago

111

TIL that Eratosthenes, along with countless other achievements, calculated the size of the earth in 240 BC using a stick, the shadow of the sun, and the known distance between Alexandria and Syene. He was off… by only 66 km.

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via reddit.com

grYyy TIL Inuvik, a Canadian Arctic town, transformed an old hockey arena into the world’s most northerly commercial greenhouse. Powered by 24-hour summer sunlight, locals grow fresh produce in 88 raised plots.
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Q7aL TIL Night vision goggles are green because we see in more shades of green than any other colour.
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vQnr TIL that the drug Daraprim costs about 5 cents in India compared to $750 in the United States!