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TIL about the Sprint missile, a hypersonic missile designed to destroy an incoming ICBM in its final phase of flight. With a 20 kiloton nuclear warhead, it would accelerate to Mach 10 in 5 seconds and glow white hot from air friction.

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v1W5L TIL that the first casualty of the Vietnam War for the United States was Richard B. Fitzgibbon Jr., who was not killed in battle but was murdered by another serviceman
a88y9 TIL The presidential yacht of Yugoslavia, Galeb, was a former Italian and Nazi warship. The Nazis minelayer was sunk by the Allies in 1944 and Yugoslavia raised it, converting it to a yacht in 1952. Ship visitors include Queen Elizabeth II, Khrushchev, Nehru, Nasser, and Kurt Douglas.
l7W8K TIL that Iceland's largest tree is a 75-year-old Sitka spruce, planted in 1949 in the forest of Kirkjubæjarklaustur. Measuring 80+ feet in 2013, the tree portrays the importance of forestry and reclaiming land for natural usage in the region's thin, volcanic soils, which are subject to erosion.
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.
wL8A6 TIL Buzz Aldrin, the second man on the Moon, Mother's maiden name was Moon.