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TIL the human eye is capable of seeing some ultra-violet light but it is filtered out by the lenses in our eye. Painter Claude Monet had that lens removed due to cataracts and may have been able to see ultra-violet in his right eye.

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lGkr Today I learned Amazon remotely deleted copies of George Orwell’s dystopian novel, 1984, that were distributed through the Kindle store in 2009. This chilling example of potentially malicious behavior would have never been possible without DRM.
4kBpJ TIL about Vinegar Valentine's. During the Victorian Era , people would send each other Valentine's that were mean-spirited and insulting to the other person
ZWRQ TIL the 1992 Radiohead song “Creep” uses a similar chord progression as “The Air That I Breathe” by The Hollies. Consequently, after winning a plagiarism lawsuit against Radiohead, Albert Hammond and Mike Hazlewood are credited as co-writers of “Creep”.
6pvW TIL that when the Gregorian calendar was implemented in 1582, Thursday 4 October was followed by Friday 15 October, to adjust to the new calendar.
KORrG TIL there was a period in French history where the country actually was represented by a plain white flag.