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TIL Jupiter's moon Europa is covered by a thick layer of ice, with a huge subsurface ocean of liquid water underneath it. Estimates give the ocean an average depth of 100km, and a radius of 877km. This equates to 3 times the combined volume of water of Earth's oceans.

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ZpRyv TIL that in 1567, Titu Cusi Yupanqui, then ruler of the Inca, wrote a formal letter to King Philip II in Spanish language, outlining the invasion of Philip's soldiers and seeking to secure recognition of his sovereignty by argumenting with the Spanish king’s own laws and Christian morals.
a8gj0 TIL about a man found dead on an Australian beach in 1948, with all the labels from his clothes removed, and a paper piece with the phrase "Tamam Shud" ("It is finished") sewn into his pocket. Later an undeciphered code was found from a book belonging to him. His identity remains unknown.
KOjbJ TIL A philomath is someone who greatly enjoys learning and studying. A polymath is someone who possesses great and detailed knowledge and facts from a variety of disciplines. Philosophy is the love of "wisdom" or "knowledge", rather than the process of acquisition thereof.
R5mO6 TIL That in 1868, Zadoc Dederick designed and built a steam-powered, humanlike robot named Daniel to pull a cart.
WkD69 TIL that in 1985 Japan Airlines Flight 123 stayed aloft for 32 minutes after the 747SR's tail ripped off. During the time before the plane crashed into Mount Takamagahara several of the 509 passengers aboard jotted down "last minute" notes to their loved ones on cocktail napkins.