TIL that there is only one instance in military history of a submarine sinking another while both were submerged: HMS Venturer sank a German U-Boat in 1945 by working out a firing solution on paper after pursuing it undetected for several hours
TIL of garden hermits, people encouraged to dress as druids and live in caves and grottoes on the estates of rich people effectively as decoration, usually receiving room and board as payment. One such hermit was fired three weeks into a seven year term after being found drinking at a local pub.
TIL about the "Curse of the 9th." Beethoven, Schubert, Bruckner, & Dvorak died after writing their 9th symphony, so Mahler believed the 9th symphony was destined to be a his last. Although afraid to write his 9th, he eventually did & died before being able to complete his 10th fulfilling the curse.
TIL that Stalin struggled with depression and summoned renowned Russian psychiatrist Vladimir Bekhterev to examine him. After the examination Bekhterev said only one word - "paranoiac". He died on the very next day from what most believed was poisoning.
TIL about Yun Sim-deok, known as Korea's first soprano. Her song "Hymn of Death" became Korea's first pop song; selling 100,000 copies after her death in 1926. Yun had been having an affair with the married writer Kim Woo-jin and the pair committed suicide together by jumping off a passenger ship.