› added 7 months ago

40

TIL about the Red Mirage vs. the Blue Shift on election day

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loRnV TIL: Cassette tapes as a format has been kept alive by a unique demographic, US prison inmates
jggp TIL A kidnapped teen did not know he was kidnapped until he applied to college…13 years after his kidnapping.
grjdX TIL that the Pubic Wars was a rivalry between Playboy and Penthouse magazines in the 60s and 70s to gradually show more pubic hair on their models without drawing obscenity charges. The “war” ended when Hustler magazine launched and immediately showed more graphic photographs.
x8do TIL that one of the first prototype looping roller coasters had a perfectly circular loop. As a result, riders were exposed to approximately 12gs of force, and frequently suffered neck injuries while riding. The modern roller coaster loop uses a “tear drop” shape to reduce G forces significantly.
7rykZ TIL Reflector telescopes can have varying focal ratios to keep the optical tube size manageable. The largest privately owned reflector telescope has a 75” mirror, is mounted on a trailer and is pulled by a truck