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TIL a hologram is a photographic recording of a light field, rather than an image formed by a lens.

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d80LB TIL To treat a malaria outbreak in Borneo, the WHO used DDT to kill mosquitoes. DDT killed wasps which were eating thatch-eating caterpillars who were eaten by geckoes & eaten by cats, who died, which led to rats, plague, & typhus. WHO had to parachute 145,000 cats into the area to kill the rats.
OGDVL TIL Ninjas did not wear black on missions, because they would not blend in with the enviroment.
Yp5mr TIL that there's a 78 year-old pharmacist, Bill Pagel, who collects Bob Dylan memorabilia. He owns 15,000 photos, 4,000 posters, and two houses that Bob Dylan lived in as a child.
GYvlQ TIL the phrase ‘Drop you a Line’ refers to a sending very short letter: a row of written text is the the singular ‘line’, delivered through a letter ‘dropped’ in a mailbox
KOlYB TIL that in Marvel comics, The Beatles are actually a group of rogue skrulls who came to Earth to invade it but decided that the money and power was better.