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TIL The malacologist Alexander Fedoslov named the four sea slugs from the group Clavus which he discovered after his favorite rock & metal guitarists: Clavus davidgilmouri (Pink Floyd), Clavus andreolbrichi (Blind Guardian), Clavus kirkhammetti (Metallica) and Clavus brianmayi (Queen)!

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BgRbW TIL in 1989, Silicon Beach Software coined "plug-in" to describe add-on extensions for their graphics app SuperPaint. They were later acquired by Aldus, which in turn was acquired by Adobe.
OoZ66 TIL When The Empire Strikes Back debuted in 1980 some showings were preceded by the short film Black Angel which was directed by Star Wars art director Roger Christian. The film was thought lost for decades but has since been recovered and is available on YouTube.
lopa1 TIL: Viruses evolve differently to adapt to their mode of transmission. A water-borne virus (e.g. cholera) is virulent because fecal matter can transmit to care-givers. OTOH, droplet-borne viruses (flu, SARS) become less virulent over time to create more ambulatory carriers for transmission.
0woYv TIL the Baltimore Ravens (NFL) and their mascot are named for the Edgar Allan Poe poem of the same name.
mxvdP TIL about Valerie Solanas, a radical feminist who founded SCUM (Society for Cutting Up Men) and attempted to assassinate Andy Warhol, going so far as to stalk him after her release from prison