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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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Dr4P TIL the computer mouse, video conferencing, teleconferencing, hypertext, word processing, hypermedia, object addressing and dynamic file linking, bootstrapping, and a collaborative real-time editor were all demonstrated for the first time in what is the called the “mother of all demos” back in 1968
LlE9 TIL the suicide rate increased 28% from 1999 to 2010 among persons aged 35–64 years.
mxQOv TIL that Keith Richards Wrote ‘(I Can’t Get No) Satisfaction’ In His Sleep
grm59 TIL Jingle Bells was originally written to be a Thanksgiving song and the lyrics don't make any reference to Christmas, instead focusing on sleigh racing.
MQJW TIL the Members of Westboro Baptist Church are basically two families.