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TIL the "Einstein refrigerator" is an absorption refrigerator which has no moving parts, operates at constant pressure, and requires only a heat source to operate. It was jointly invented in 1926 by Albert Einstein and his former student Leó Szilárd, who patented it in the US on 11/11/1930.

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BrXVK TIL barns are painted red because old paint recipes contained ferrous oxide (rust). Rust was plentiful on farms and because it killed fungi and mosses that might grow on barns, and it was very effective as a sealant. It turned the mixture red in color.
8aaPZ TIL that if you spent one day on each of the islands in the Phillippines, it would take you almost 21 years to visit them all.
jN90N TIL During the Middle Ages, small triangular-shaped stones — thought to be the tongues of snakes turned to stone by Saint Paul — were highly sought after as cures for poison and plagues. Centuries later, the “tongue stones” were identified as fossilized shark teeth.
xGxo TIL In 1996, a socialist bicycle sharing experiment, the “Orange Bike Project” organized in Tucson, Arizona was terminated after only five months of operation due to the 80 bright orange bikes, available for anyone, had all been intentionally damaged or stolen within a few weeks.
kJrmg TIL: People Use Wasp Spray “wasp dope” as a Drug