› added 5 years ago

268

TIL A telescope designed to view the H-alpha emission produced by excited hydrogen can show granulations on the solar surface and great detail in the sunspot regions. The H-alpha filter must be designed to produce a very narrow pass band around the wavelength of 6,562.8 Ångströms for safe viewing

Read more ianmorison.com

via reddit.com

6Ermm TIL that in Japan the cinema genre "Spaghetti Western" has been changed in "Macaroni Western" because in Japan spaghetti are conceptually "thin and meager", far from the iconic stories told in the movies.
BgKxD TIL about Atalanta, a heroine from Greek mythology who offered to marry any suitor who could outrun her in a race, but could defeat any man in a race, until Hippomenes got some help from Aphrodite to beat her in a race.
vr0r TIL of Dr. Jerri Nielsen, a doctor stationed at the South Pole who diagnosed, biopsied and treated her own breast cancer during the overwinter period when the crew is normally isolated from the outside world. In complete darkness, medical equipment had to be airdropped from military aircraft.
gkmW TIL that the California Highway Patrol (CHP) provides free roadside assistance to motorists stranded on California highways. This includes a gallon of gas, jumpstart, radiator fluid, hose patch, and a free tow if needed.
ADdQx TIL about Jára "The Master" Cimrman, a noted playwright, educator, inventor, and philosopher. Cimrman was voted "The Greatest Czech" in a national contest until he was disqualified for being fictional. Created on a radio show in 1966 to criticize the Communist government, he's become a folk hero.