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TIL Though the royal figures on modern playing cards do not represent actual people, names were assigned to them: Charlemagne (hearts), David (spades), Caesar (diamonds), and Alexander (clubs). The names of the queens — Judith or Judic (hearts), Pallas (spades), Rachel (diamonds), and Argine (clubs)

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LwRv TIL “Judas” goats helped eradicate invasive goats in the Galápagos Islands. These goats are sterilized, GPS tracked, and given hormones to attract other goats so that armed hunters could kill all the goats from a helicopter, but leave the Judas goats alive so they could be used to find more goats.
1a16V TIL the name "Lego" is derived from the Danish phrase “leg godt” which means "play well"
D1GbV TIL the United States of America not only used the Marshall Islands as a nuclear bomb test site, but also used the Natives as Guinea pigs for their radioactive experiments.
QbOk TIL in a German village called Fuggerei the rent hasn’t been raised since 1520, it costs only 88 cents to live there for an entire year.
eb4 TIL the mold in blue cheese is Penicillium