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TIL scientists have figured out how to make wood that is stronger and tougher than steel alloys

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d8Bnr TIL: Paris had a pneumatic post system, where you could send your mail through tubes until 1984!
grl98 TIL In a hurdling event , you are not penalized for knocking over a hurdle
4kWow TIL the brain literally shrinks during dehydration. Even mild dehydration (1–2%) causes the brain to temporarily contract, which is why thinking feels harder.
QNplE TIL about Barbara Morgan, the backup teacher astronaut for Christa McAuliffe on the Space Shuttle Challenger. After the 1986 disaster, she returned to classroom teaching, was later selected by NASA as a mission specialist, and in 2007 became the first teacher to fly to space.
9wL4B TIL about laboratory-grown penises