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TIL the first time Led Zeppelin licensed one of its songs for commercial use was giving the song "Rock And Roll" to Cadillac for a television commercial. The band earned a "ridiculous" fee for this but Cadillac saw sales increase by 16% the following year.

9nEQ TIL that a convent of nuns in the Middle Ages began to meow like cats and others followed until all would meow together at a certain time for several hours together. This continued until the surrounding village called soldiers to force the nuns to stop their meowing.
7r5JZ TIL Teddy Roosevelt is the only president that had a tattoo
ADNWa The human brain looks like a big, pinkish-gray, wrinkly walnut. There are so many folds in it that, if it could be unfolded, it could be a small tablecloth. Pinkish-gray might not match your decor, but it would be about the right size! This "tablecloth" is made up of the cerebral cortex and is the wrinkly outside layer of your brain. All those folds are responsible for abstract thought, language, and memory. Scientists believe the wrinkles exist as a way to increase the surface area of the cortex, allowing for increased brainpower in a smaller space. In this week’s Today I Learned, neuroscientist and National Geographic Emerging Explorer Steve Ramirez shares some of his smarts on how your cortex is different from your pet hamster’s.
npkr TIL The goliath tigerfish is said to be a bigger and deadlier version of the piranha. It has 32 teeth that are of similar size to those of a great white shark and has been known to attack humans and even crocodiles. It has only ever been caught by a handful of fishermen due to the danger it poses.
1NLV TIL “Radium Girls” painted clock dials with self luminous paint, and would then apply the same paint to their teeth, nails and skin to give a glowing appearance. Their remains are still highly radioactive and glow to this day due to the 1600 year half life of Radium.