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TIL viruses (100nm) are smaller than the wavelength of visible light (380-740nm), so light doesn't bounce off of them. They are therefore invisible, and can only be seen with electron microscopes.

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Yk1A TIL there is a website that lists all the Mythbusters experiments and their results
BMKd TIL During the Panic of 1907 John D. Rockefeller, the wealthiest man in America, pledge half of his wealth to maintain America’s credit.
gdKb TIL the welsh word for microwave is popty ping
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