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TIL Pink has no corresponding wavelength, it’s our brains filling in the gap between ultra violet and infra red light in the color spectrum. Put simply, pink is what you get when you remove the color green from white light.

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nMMW TIL of the Forer Effect, the observation that individuals will give high accuracy ratings to descriptions of their personality that supposedly are tailored specifically for them but are, in fact, vague and general enough to apply to a wide range of people.
Z81gv TIL that The Hoover Company had a free flights promotion in the 90s: customers were offered free return tickets to the USA if they purchased at least $120 worth of products; it ended in disaster and the company is said to have cancelled the promotion and reneged on its offers, leading to litigation.
RYG8 TIL Birds have two fovea, meaning they can switch between focusing on their central vision and their peripheral vision. You never know when a bird is looking directly at you.
JxWl TIL One of Amazon’s earliest employees brought his Corgi, Rufus, to work each day. He became such a fixture that the company named a building after him and allows employees to bring their dogs to work. Amazon has over 2,000 four legged “employees”, averaging nearly 600 per day.
9YaNB TIL about Hobo Signs - Beginning in the 1880's up until WWII, hoboes placed markings on fences, posts, sidewalks, buildings, trestles, bridge abutments, and railroad line side equipment to aid them and others of their kind in finding help or steering them clear of trouble.