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TIL IBM designed a supercomputer in 2008 to run the entire internet -- a global-scale computer.

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WGaN TIL that there is a mushroom that is safe to eat but can kill you if you drink alcohol afterwards.
EVD7 TIL the Thirteen Club met in the 1880s to debunk the superstition about the number 13 by dining 13 to a table, walking under ladders, and spilling salt on Friday 13th. They had 5 US Presidents as members, Chester Arthur, Grover Cleveland, Benjamin Harrison, William McKinley and Theodore Roosevelt.
kR5E TIL: of the foldscope. A microscope that provides magnification from 140X to 2,000X. It is assembled from a punched sheet of cardstock, a spherical glass lens, a light emitting diode and a diffuser panel, along with a watch battery. It is designed to cost less than US$1 to build.
7rJlX TIL: China is running multiple AI experiments which include grading students as focused or distracted based on their facial recognition data without students' consent.
dWa9 TIL when Michael Richards apologized on David Letterman for his racist outburst in 2006, the audience laughed, thinking it was a joke.