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TIL that reintroducing wolves to Yellowstone changed the entire geography of the park: as elk were displaced, saplings that would have been eaten by elk were spared, riverbank erosion was brought under control, and streams and rivers shifted their courses.

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nWwgG TIL that JFK and Garfield were the only two US presidents to end their terms under the age of 50. Both were assassinated.
VXEG TIL that Darth Vader’s mask was inspired by an old Swiss Army helmet.
5yXp TIL the FDA relies on studies performed by the companies seeking approval of chemicals they manufacture or want to use. No other developed country has a system where companies decide the safety of chemicals put into food. Many food additives allowed in the U.S. are banned in other countries
m1vBO TIL that famous musician David Bowie, born David Robert Jones, adopted his last name from James Bowie (1796-1836), soldier at the Texas Revolution and Battle of the Alamo and namesake of the Bowie knife.
j6oQa TIL that "poetry" is named after the writer Edgar Allen Poe.