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TIL while viewing a solar eclipse on 18 August 1868, French astronomer Pierre Janssen made an observation that led to the discovery of helium. It was the first time a chemical element was discovered on an extraterrestrial body before being found on the earth.

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b6bE TIL Stanley Kubrick’s decision to only use classical music in what would become the iconic soundtrack for “2001: A Space Odyssey”, was made last minute in post-production. Alex North, who’d written an entire score for the film, didn’t find out his music had been discarded until the premiere.
E1rjW TIL the word "Apple" didn't always refer to the specific fruit. As late as the 17th century the word was used for all fruits that weren't berries.
x6LZ5 TIL that Canada has about twice as many Costcos versus the US on a per capita basis.
jGkE TIL that 12 African nations have come together pledging to build a 9 mile wide band of trees that will stretch all the way across Africa, 4750 miles, in order to stop the progressive advancement of the Sahara.
loL41 TIL Fieldfare birds defend their young from ravens and other predators, by "dive-bombing" the predators with their poop. The poop glues the raven's feathers together.