› added 4 years ago

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TIL what the black circles in the microwave window are for! “It’s designed to prevent electromagnetic energy from escaping the microwave and protects you from radiation.” The holes are small enough to protect you, but are still big enough to let you see!

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via reddit.com

dmpj TIL that lawns began in England as a symbol of status; it showed that the owner could afford to keep land that was not being used for a building, or for food production.
xw7B TIL German Submariners had the highest casualty rate of all forces in WWII - 70% died in service
BrVYy TIL that reindeer are the only mammals that can see ultraviolet light. This means that they can easily tell the difference between white fur and snow because white fur has much higher contrast. It helps them discover predators early in snowy landscapes.
j85n TIL NASA validated space drive engine technology it had been dismissing as impossible for years. this engine converts electric power into thrust with no need for propellant. NASA can not explain how it works, but has named it the “quantum vacuum plasma thruster”
dygZ TIL in 1918, after a white man was killed by a black man, a white mob went on a week-long riot and killed at least 13 people, including an African-American woman. She was burned alive, and her unborn baby was cut from her stomach and crushed because she spoke out against her husband’s murder.