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TIL that hummingbirds, while in flight, have the highest metabolism of all animals – a necessity to support the rapid beating of their wings during hovering and fast forward flight. Their heart rate can reach as high as 1,260 bpm.

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7wBM TIL that all through the 20th century, and up until 2007, parts of Lower Manhattan were still wired up with and using Edison’s original 110V DC.
wVV8 TIL Apple used ‘Carl Sagan’ as a codename for a computer in the 1990s. Carl Sagan sent Apple a cease-and-desist letter, and Apple changed the name to 'Butt-Head Astronomer’. Carl Sagan sued for libel and lost, and Apple changed the name to 'Lawyers are Wimps’.
rNGQ0 TIL indigenous Americans made pictorial calendars called “Winter counts” that recorded events or information important to their tribe.
ADaXn TIL China's single child policy resulted in groups of people that had never encountered genetic siblings. The notion of "sibling" was a hard one for the children to grasp - a task made more difficult by the Chinese tendency to use the term for "brother" or "sister" when talking about cousins
D17r TIL there is a functional cure and vaccine for HIV ready for human trials. It is thousands of times more effective than traditional vaccines.