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TIL studies show that an increase in Facebook usage is heavily linked to decrease in satisfaction with your own life and higher liklihood of depression.

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v1lxK TIL the 2002 SARS virus also originated from cave dwelling bats, discovered through tracing by scientists at Wuhan Institute of Virology.
78aZX TIL any bullet fired into the air that's heavier than a .22LR - and even that if fired close to vertically - can be lethal on the way down.
w7p6 TIL that the Pitcairn Islands, a British Overseas Territory with a population of 56, has legalised same-sex marriage, despite not having a single same-sex couple on the island.
Oo5Z7 TIL of “telling the bees”, a European custom in which bees would be told of important events in their keeper’s lives, such as births or marriages. If the custom was forgotten then it was believed the bees would leave the hive or stop producing honey.
XEvbR TIL putting LED lights on float lines of 864 fishing gillnets reduced the bycatch of sea turtles by 74.4% & by 70.8% for dolphins, whales, & porpoises. The same amount of targeted fish were caught by both 864 lighted gillnets & 864 unlighted gillnets in a study of 3 ports in Peru from 2015 - 2018.