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wikipedia.org
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TIL the reason why NASA (and later the Russians) use a specialised space pen instead of pencil in space is because the graphite of pencils is conductive and can cause short circuits and even fires. The pens have been used since the Apollo era and are still being used right now on the ISS.
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TIL that 35% of the world’s population live in countries that drive on the left hand side of the road.
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TIL after losing a son and extreme financial hardships, the song "It Is Well With My Soul" was written by Spafford while on his way to meet his grieving wife as he passed by the area where his four daughters had recently died from a collision in the Atlantic Ocean.