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TIL that in an effort to save $43.5, the Canadian Mint mailed the dies of the new $1 coin via a discount courier over using an armored car- which were promptly stolen and have never been found. This would lead to the adoption of the Loonie design as an emergency replacement.

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xV5L1 TIL Before the addition of the yellow traffic light in 1920, drivers only had a buzzer to warm them when the light would turn from green to red.
YperP TIL that astronauts in orbit are not weightless because they escaped the Earth's gravity, but because they are in free-fall. The ISS at 400KM altitude still experiences around 90% of the Earth's gravity.
Dbxg TIL that the actor who killed Ricky in Boys in the Hood ended up being convicted of a double murder in real life and getting murdered himself in prison by his satanic cellmate.
4X7QJ TIL Dr. Charles R. Drew, an African American, developed improved techniques for blood storage, which saved thousands of Allied forces' lives during WWII. In 1942, however, he resigned as director of the first American Red Cross Blood Bank because of their exclusion of African-Americans' blood.
6980W TIL In 1902, Lionel Walter Rothschild brought 6 Edible Dormice (Glis glis) back to Tring, England from Hungary. Some of the 6 escaped, breeding and growing to an estimated 10,000 mice in a 200 mile radius around Tring that are both an invasive species and protected species.