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TIL According to a 2006 study by the National Research Council, the thermoneutral zone for a domestic cat is 86 to 97 degrees Fahrenheit. That’s the range of temperatures in which cats are “comfortable” and don’t have to generate extra heat to keep warm or expend metabolic energy on cooling.

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KYOy9 TIL there is baseball for the blind, called "Beep Baseball" where the baseballs beep and the bases buzz so the blind players can find them.
nWaD9 TIL about the death of 9yr old Stanton Walker. A spectator at a baseball game in Morristown(ohio), he was struck by a foul ball while a knife was passed between his companions for the purpose of sharpening a score keeping pencil. The knife lodged between his ribs and he died in minutes.
a8ENN TIL There is a bar named Jack Ruby's Saloon in downtown Dallas mere blocks from The Sixth Floor Museum and Dealey Plaza (Site of JFK assassination). The history buff owner loves the fact that Ruby, who shot JFK's assassin, owned a bar and sells T-shirts that says "I took a shot at Jack Ruby's."
OKw6 TIL of Positronium, a nearly massless element made out of a meta-stable mix of matter and antimatter with no protons or neutrons. It can even form chemical compounds such as Positronium Hydride. When it does collapse, it releases pure energy as flash of gamma radiation, leaving nothing behind.
B4bW TIL a woman was allowed to join the Fire Department of New York despite failing a mandatory physical skills/fitness test.