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TIL that mitochondria and chloroplasts were originally separate prokaryotic organisms (single celled organisms) engulfed by eukaryotic cells (plant and animal). Now they are part of our DNA due to a continued endosymbiotic relationship.

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R7P14 TIL in 72, after Led Zeppelin had released 4 platinum albums, a festival mgr. wrote manager Peter Grant requesting a booking of "Led Zeppelin and his backing group." Grant replied by taking out a full page ad in a music industry publication in the form of a letter captioned, "Mr. Zeppelin regrets."
kOa7B TIL in 1992, a retiree was out searching for a lost hammer with a metal detector. During his search he found a huge cache of Roman treasure, including 15,234 coins. The British government gave him and the owner of the land £1.75 million for finding it. Later on, he also found the hammer
54n TIL Paper Wasps can learn and recognize faces of other Paper Wasps, making them one of the few lifeforms with the ability of facial recognition.
nkyY TIL Jaimee Foxworth who played the youngest Winslow on the show “Family Matters” (Judy) was written out of the show with no explanation after asking for a raise. She went on to star in porn under the name “Crave”
4Xl0o TIL Canada has an older 'continually running' monarchy than the UK, having been initially established in the 16th Century. While being under British Rule, French Rule, and ultimately an independent monarchy, there has not been a time since Canada has not had a monarch.