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TIL that a “fossil word” is a word that is generally obsolete but remains in use because it is part of an idiom. For example, amok as in “run amok”, or turpitude as in “moral turpitude”.

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gMYeW TIL: During the Vietnam War one damaged American F-4 Phantom fighter pushed another damaged F-4 away from certain capture by resting the second airplane’s tail hook onto his own cockpit glass and pushing him to a safer location before both crews bailed out and were rescued the next day.
7QLZ TIL Sean Penn, Robert Downey Jr., Charlie Sheen, & Rob Lowe all are friends from high school.
KXME TIL there is enough energy in one hour of sunlight to serve the entire planet’s energy needs for approximately one year.
0kjp TIL the state of Indiana once tried to pass a bill saying that Pi was exactly 3.2
X0eKR TIL: to clear land for logging in Canada, forestry workers, often students and junior rangers, spent weeks at a time as human markers holding red, helium-filled balloons on fishing lines while low-flying planes sprayed Agent Orange on the brush and the boys below. "We were saturated in chemicals"