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TIL on 21 September 1956, the Grumman F-11 Tiger became the first jet aircraft to shoot itself down.

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jkGQ TIL scientists have found that the perception of time varies as a function of mass & metabolic rate across species. Smaller animals w/ faster metabolisms can respond to visual stimuli at a faster rate b/c they perceive movements & events to unfold more slowly (like bullet dodging in the Matrix).
ZpZED TIL Deaf people each have unique “name signs” given by a friend or family member, and per the culture only a deaf person can give a hearing person their own special name sign
jN1Vn TIL most of Japanese schools don’t have janitors. Instead there is a tradition of students cleaning their own classrooms and school.
NnJ TIL 20% of the entire world’s unfrozen freshwater is in a single lake.
R5757 TIL that Oliver Sipple was a former US Marine who intervened in the assassination attempted against U.S. President Gerald Ford. This event also led to his unwilling outing and estrangement from family.