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TIL Plastic injection molding was invented in the 1800s to manufacture billiard balls out of celluloid, chiefly to replace ivory and save the lives of African elephants

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OGML4 TIL the Köçek were young male slaves or Romani dancers who usually cross-dressed in feminine attire and were employed as entertainers in the Ottoman Empire during the 17th Century. Men were known to fight and occasionally kill for the opportunity to have sexual intercourse with them.
WldA TIL that when smoking was allowed on aircraft, engineers used nicotine stains on the outside of planes to detect microscopic cracks in the fuselage. Now that smoking is banned, these cracks have become much more difficult to detect.
AQY7 TIL the world record for non-stop Pushups: 10,507 by Minoru Yoshida, 33 years ago!
9YMVr TIL that depression can be a symptom of untreated or poorly-managed ADHD. Chronic under-stimulation can lead to depression as "the ADHD nervous system feeds on interest and challenge".
ldbA TIL there are more Norwegians in America than there are in Norway