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TIL Modern capital letters are derived from a style called uncial. This style was developed by monks when writing manuscripts because of its ease to write in.

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DkLP TIL there’s a penguin in Japan that wears a penguin backpack and goes into the market to eat fish
0kjp TIL the state of Indiana once tried to pass a bill saying that Pi was exactly 3.2
7rgDO TIL When Sir Richard Owen (a critic of evolution by natural selection) bought a recently discovered Archaeopteryx feather, he was embarrassed to discover it was a missing link between reptiles and birds, which contradicted his belief that God had created the species by tweaking 'archetypes'.
M7RJW TIL there's a species of fruit fly whose sperm cells are over 2 inches long.
BrvGD TIL a study found tobacco and tomato plants emit ultrasonic "squeals" when stressed. Microphones 4" away picked up the sounds when plants had stems cut/were under-watered: an average of 15 - 25 sounds within 1 hr from cutting, and 11 - 35 sounds per hr from drought.