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TIL one of Jupiter's moon, Europa is known to have a huge ocean underneath its icy surface. NASA is developing an ice-penetrating technology called ARCHIMEDES that uses laser light to penetrate Europa's crust and allow explorers to access its underlying ocean.

Read more science.nasa.gov

via reddit.com

yQgvX TIL about Giovanni de Ventura, a municipal plague doctor for the town of Pavia in late XV century Italy. He wasn't to require fees from treating patients, as the city of Pavia provided generously for him in terms of salary. He may also have donned the "beak doctor" attire.
GGG5 TIL In 1905 Norway voted 99.95% in favour of independence from Sweden and only 184 opposed
7nwp TIL: A low-frequency noise of unknown source, “The Hum”, is heard by some people across the planet.
9YbbG TIL stars don’t actually twinkle. Light rays penetrate through different layers of air, distorting the brightness. That’s atmospheric Refraction.
0dQOL TIL In the sixteenth meeting between Wisconsin and Minnesota in 1906, President Roosevelt had to intervene by canceling the game because too many deaths and injuries occurred on the field.