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TIL CAT, the heavy equipment manufacturer, is short for Caterpillar.

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woDX7 TIL India has a No First Use nuclear policy, meaning it will only use nuclear weapons in retaliation against a nuclear attack on Indian territory or Indian forces.
P1YOe TIL of "Unit 731", a secret Japanese research facility disguised as a water treatment plant during WWII. Responsible for some of the most notorious war crimes ever committed, researchers captured by the USA were secretly given immunity in exchange for the data gathered from their human experiments.
Mr8A TIL that the 1977 University of Evansville Men’s Basketball Team was killed in a plane crash. One player didn’t make the trip due to an illness. He was killed in a car wreck 2 weeks later.
Z8V4v TIL of Chlorine trifluoride, which can set glass on fire and corrode materials otherwise known to be non-corrodible such as iridium, platinum, and gold.
ZpLra TIL that Primus opened for U2, Public Enemy, Anthrax, Fishbone, and Rush in the span of a single calendar year (October 1991—September 1992)