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TIL Reyn Guyer is a game designer whose first hit was Twister. In 1969, he invented "the world's first indoor ball". It was made of polyurethane and named after the foam used by off-roaders to cover their roll-bars: Nerf.

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kJnZ4 TIL the dark-grey color we see when we close our eyes isn't black, but Eigengrau (intrinsic grey)
81Qb TIL that tarantula spiders reach full adulthood at around 10 years and female tarantula spiders have been known to live up to 30 or even 40 years.
GARWN TIL Whiskey and Whisky are different distilled spirits
5r8p TIL An artist carved a black violin (Blackbird) from his grandfather’s headstone (diabase), and used mammoth ivory for the bridge, gold leaf for the interior, Harjedalan (black) rock for the back plate, and ebony for the rest. It took him 2 years to make and weighs 2 kilograms.
OGagL TIL oily rags can catch fire from self combustion including Linseed Oil