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TIL: One Hollywood movie studio complex was used only by the US military for making secret films --mostly editing footage of nuclear weapons tests. The activities of the so-called "Lookout Mountain Air Force Station" ended in 1969, but remained largely unknown to the public until the 1990s.

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via reddit.com

M7KwV TIL that Dennis Rader, the serial killer known as BTK, worked at ADT Security Services from 1974 to 1988, where he installed security alarms as part of his job, in many cases for homeowners concerned about the BTK killings.
OoVvg Researchers from University of California San Diego School of Medicine and Arizona State University found that if a car is parked in the sun on a summer day, the interior temperature can reach 116 degrees F. and the dashboard may exceed 165 degrees F. in approximately one hour — the time it can take for a young child trapped in a car to suffer fatal injuries.
GZaj TIL Chris Farley was hired to voice Shrek and had finished 80-90% of his recording sessions at the time of his death
oBrBE TIL one of the reasons the Chinese never fully developed gunpowder weaponry was because their walls could sustain artillery bombardments. Even 20th century artillery guns had trouble piercing their walls.
Ov6X TIL that David Bowie’s permanently dilated pupil was the result of a punch to the face in a fight over a girl. Despite their altercation, he and George Underwood stayed friends and Underwood went on to do the artwork for Bowie’s early albums.