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TIL that in 1997, Cornell University created the world's smallest guitar at 10 micrometers. This is roughly the size of a single cell.

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dDjl7 TIL the ViewMaster was introduced in 1939. Film and paper were scarce, and production nearly stopped due to WWII, but a contract to produce airplane and ship identification and range estimation reels saved the product. The military purchased 100,000 viewers and six million reels during the war.
QJ6Mp TIL that the '=' sign was designed in 1557 by Robert Recorde, having gotten fed up with writing 'is equal to'. He decided that there was nothing more equal than two parallel lines, and designed the symbol from that logic
YBZW TIL Fred Smith received a C on his Yale business school paper which essentially outlined the business plan for what later became FedEx.
vPQKj Til about Ancient Roman festival Lupercalia. During festivities young men would run through the city naked and strike passers-by with strips made of goat's skin. Some women would purposely get in the way, believing it would bless them with fertility.
ne5xG TIL of the Biltmore Estate, a Châteauesque-style mansion built for George Washington Vanderbilt II and is the largest privately owned house in the United States.The grounds and buildings of Biltmore Estate have appeared in a number of movies such as the house of Richard "Richie" Rich, Jr.