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TIL the cylinder at the end of some power cords is called a ferrite bead, which helps block electromagnetic interference from going out or coming into the device; in short, it prevents a device from acting as an unintentional radiator or antenna.

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via reddit.com

rNmxW TIL about promession, an unapproved green alternative to embalming where human remains are frozen, vibrated into dust, then freeze-dried.
Z4mY TIL that two surgeons used a coat hanger, brandy, and a tube to operate on a collapsed lung during an airplane flight and succeeded
WkDYX TIL about NUFORC, the National UFO Reporting Center, which receives now hundreds of reported sightings each month. Here’s an interesting one I found from 1955:
VbXQ TIL The “Dog Days of Summer” meaning comes from the dog star Sirius, and that the star would rise just before the sun mid-summer (the hottest days of the year)
J1Da8 TIL about Lydia Litvyak aka White Lily of Stalingrad, the world's first female fighter pilot to score a kill in combat and later to become the first of the only two female fighter aces, scoring 12 solo and 4 team aerial victories in about a year of active combat duty. She was KIA aged 21 years old.