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TIL NASA as a practical joke played Hello Dolly to wake the Gemini 6 crew in 1965. The astronauts loved it and a tradition was born. Until 2011, families were allowed to choose a favorite song to wake up their loved one in space.

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D1Ejj TIL about the polio epidemic of August 1952 in Copenhagen, Denmark. This epidemic ushered in the widespread use of positive-pressure ventilation, replacing the negative-pressure iron lung machine. It is also during this time that the concept of an intensive-care unit (ICU) was first introduced.
GY0WQ TIL if all the above-ground gold in the world were melted together and formed into a cube, it would measure approximately 21.7 meters (71 feet) on a side
neQeP TIL vegetables are any part of a plant that is consumed by humans or other animals as food, which means from a botany perspective "there is no such thing as a vegetable."
1dMV TIL : There is a short German rhyme about procrastination that also rhymes when translated to English. “Morgen, morgen, nur nicht heute, sagen alle faulen leute.” in English means “Later, later, not today, all the lazy people say.”
YpRxP TIL a woodpecker's head endures 1500 G's (g-force). It distributes most of the energy to it's body, while the head only experiencing 0.3% of the total force which dissipates as heat. They have to take breaks in pecking to cool down the inside of their skull.