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TIL: In Mexico City, some bird species, like house sparrows and finches, use discarded cigarette butts to line their nests. Researchers believe the nicotine in the filters acts as a natural insect repellent, helping the birds fend off parasites such as mites and lice.

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ADZ1x TIL Rian Johnson wanted to show extreme violence in The Last Jedi's final battle, but couldn't do so in a PG-13 movie. To solve this, the planet Crait was covered in a layer of salt which, when displaced by the fighting, revealed a red landscape and made the battlefield appear drenched in blood.
oRlw8 TIL Princess Sophie of Hohenberg, the daughter of Archduke Franz Ferdinand, lived up until 1990.
xVnjb TIL about Salps - a jellyfish relative. They asexually reproduce chains of clones who are all female, which then detach and breed sexually. After giving birth to a single asexual offspring they become male, while the offspring starts the cycle over.
6ErG7 TIL about the Battle of Cannae, in which the Carthaginian general, Hannibal crushed a Roman Republic army, resulting in an estimated loss of 55,000 - 70,000 men for the Romans, and is considered one of the most significant battles in history.
LkxnZ TIL during a 2000 celebrity edition episode of "Who Wants To Be A Millionaire", comedian Norm MacDonald made it to the million dollar question, but passed on it to not risk it. However, his anwer was right.