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TIL In 2014, GM issued an 800,000-car recall due to faulty ignitions. The automobiles would turn off while being driven, resulting in the loss of power steering and brakes, as well as the failure of the airbags to deploy. They have known about the issue since 2005, but never corrected it.

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R7p88 TIL Black Bears are killed for their skins to make Marge Simpson type hats for the Queen's Guards. In 2015, they purchased 122 hats for £1,224 each. There have been calls by animal rights groups to phase out this practice.
4XBK5 TIL Ketamine is a potent antidepressant. A single low, sub-anesthetic dose of ketamine given via intravenous infusion may produce antidepressant effects within four hours in people with depression. These antidepressant effects may persist for up to several weeks following a single infusion.
O7A4 TIL the small fish that swim next to sharks are ‘pilot fish’. They swim next to sharks to avoid being preyed on and in return sharks do not harm them as they kill their parasites - thus having a “mutualist relationship”.
E1WN7 TIL Hippopotamus Milk is Pink in Color. Hippopotamuses produce two unique skin secretions (so unique they're named after the animal), "hipposudoric acid" and its analog "norhipposudoric acid". It gives the hippopotamuses' sweat a red coloration, commonly believed to be blood (it's not).
Z85YQ TIL that it's actually illegal for companies like FedEx to ship "non-urgent" letters unless the customer pays at least six times the value of USPS postage.