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TIL that the oldest recorded piece of music is the ‘Hurrian Hymn no.6’ and is 3400 years old.

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b9yw7 TIL that butterflies and bees need salt to survive, so they sometimes drink the tears of crocodilians such as caimans and other animals in regions where the mineral is scarce.
Brd4x TIL that Burning Mountain in Australia contains an underground coal fire that has burned for approximately 6000 years and is the oldest known coal fire.
D1epv TIL : we finally developed a new steel alloy as light as titanium!
OOR4 TIL The “X” in X-Ray was just a random letter because Wilhelm Roentgen didn’t know what it was.
JYaD4 TIL in 1997 an experiment to build a castle, using only medieval tools began, and twenty one years later they're more than half way finished.