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TIL that Weird Al Yankovic always asks permission to do a parody from the original artist, even though, under the Fair Use Act, he is not legally required to do so.

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KO6O4 TIL that just like humans, dogs have an oil on their bodies that converts to vitamin d when exposed to the sun. Unlike humans dogs cannot absorb this oil, and must instead invest it via licking and grooming.
W7gb9 TIL In 2018, a Killer whale named Tahlequah, known to researchers as J35, grieved over her dead calf by carrying it across the ocean for 17 days and over 1,000 miles, refusing to let it sink.
Z8J4a TIL the ZZ Top song "Master of Sparks" is based on a true story of people who used to weld together a spherical cage with a seat inside and then push it off a truck going 60 MPH with a person inside. Whoever survived got the title of Master of Sparks - one of them was ZZ Top guitarist Billy Gibbons.
VDW4 TIL an early AIDS victim was dubbed “Patient O” but a typo changed this to “Patient Zero” and he has since been blamed as the origin of the virus in the USA.
xVjrg TIL There is a functioning mail box located 10m underwater off the coast of Japan, that receives hundreds of mail items every day.