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TIL that because the Conférence Générale des Poids et Mesures requires that because upper-case letters are only used for units named for people, Ken Woolner was inspired to create a scientist, Claude Émile Jean-Baptiste Litre, which would allow people to use L for litre and avoid mixing up l and 1

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ANgdn TIL not only was Neil DeGrasse Tyson at the WTC on 9/11, but with his camcorder he captured everything from the 2nd plane hitting to both towers collapsing. While he has released screenshots, he has declined to publish the full tape, feeling it was too intimate to be tastefully shown to the public.
9w7jX TIL that Toronto, with a tree canopy rivaling the world’s largest cities, has over 22,000 fruit-bearing street trees, including cherries, apples, pears, plum, and the most common hackberry! There’s even a map showing when and where these trees ripen each month.
l7YE5 TIL about the 2004 Indian Ocean earthquake and tsunami that killed an estimated 224,000 people. It is not even not even in the top 10 for deadliest natural disasters in history.
4RQ6 TIL In 2007, a Bowhead whale was discovered with the head of an explosive harpoon embedded deep under its neck blubber. The projectile was manufactured in New Bedford, Massachusetts in 1890.
B8My TIL that Google calculates traffic by tracking how fast Android devices are moving on the road.