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TIL the complete dashboard light guide

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5YB08 TIL that the females of most bird species only have one functioning ovary (the left one). The right one exists, but does not develop fully and is non-functional. This is probably an adaptation to reduce body weight for flight.
wKE1 TIL an Army dentist was able to mow down almost 100 enemy soldiers with a machine gun in WWII to protect his wounded soldiers.
awPlo TIL: According to the American Sleep Apnea Association "We should feel refreshed and alert upon awakening and not need a day time nap to get us through the day"
7rP47 TIL that the elderly in Japan decided to clear up the nuclear waste so that the young were not exposed to it.
Z8Ayo TIL that "blood rains" mentioned in the Old Testament and throughout religion are a natural phenomenon caused by spores of green microalgae and dust. Sometimes recurring frequently for up to a month, red rains have frequently been recorded in parts of southern India and Sri Lanka.