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TIL original Trek was cancelled after season 2, the Klingon ship model was made as merchandising, and then Trek was renewed for a third season, allowing the show to use the model which had not been created to be a series prop.

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R5V88 TIL the first successful public demonstration of ether anesthesia took place on October 16, 1846, at the Massachusetts General Hospital in Boston. Morton administered ether to a patient undergoing surgery to remove a tumor from his neck, rendering the patient unconscious and insensitive to pain.
AD757 TIL the Pot-in-pot refrigerator uses a porous outer clay pot (lined with wet sand) containing an inner pot within which food is placed. The evaporation of the outer liquid draws heat from the inner pot, and requires only a flow of relatively dry air and a source of water, but no electricity.
yJB8 TIL that there is a second “Mona Lisa” painting held in a secret vault in Switzerland also thought to have been painted by Leonardo DaVinci that shows a much younger version of the female subject
KYr0R TIL During WWII, the company Steinway introduced a piano model specifically designed to be deployed via airdrop
loa7B TIL Ice can have up to 18 crystalline phases, depending on pressure, temperature, and the process of formation. Hexagonal ice, the one most common on Earth, is very rare in outer space.