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TIL of diamond fluorescence which effects about 30% of diamonds and causes them to glow under UV light.

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VBMN4 TIL of "oxygen candles", which release oxygen when burned. They are used as an emergency supply of oxygen in submarines, airplanes, and the space station.
gMEPy TIL the smaller chunks that break off of icebergs are officially called "bergy bits"
wLNkE TIL that both the Carpathia (which rescued Titanic's passengers) and the Californian (which was nearby but allegedly never saw Titanic's distress signals) were both sunk in WW1. Carpathia lies in 600 feet of water off of Ireland and California lies somewhere off of Greece but has never been found
W7gLX TIL in 1977 East Germany and Vietnam entered an agreement: in exchange for technical assistance and expertise in the project, Vietnam would plant coffee and provide East Germany with half the crop. By the time the trees were mature enough for harvest, East Germany collapsed.
d0j TIL the largest waterfall on Earth is actually under the ocean.