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TIL of the Mayerling Incident where Rudolf, Crown Prince of Austria, & his mistress, Mary Vetsera were found dead in an apparent murder-suicide in the woods on January 30th, 1889. This destabilisation led to successive developments like the assassination of Archduke Franz Ferdinand.

wLgLE TIL in 2007 there was a pet food recall on imported pet food from China that killed more than 8,500 pets. Congress enacted laws for the FDA to set new guidelines within 2 years. In 2016 the FDA reported they're still "drafting a regulation" and in 2018 Congress removed the guidelines for pet safety.
GMjJ TIL: North Koreans have the smallest penis size when sorted by country
6EDZZ TIL that the CocaCola-Mentos reaction is not a chemical but a physical reaction. Gas dissolved in CocaCola needs a surface to form on. We can increase that surface by adding Mentos. The microscopic surface of Mentos is quite rough, so it allows a lot of gas to form and it creates a lot of pressure.
XVBX TIL: Huddie Ledbetter also known as “Lead Belly” was convicted on charges of murder and attempted murder, Lead Belly literally sang his way to freedom, receiving pardons from the governors of Texas and Louisiana. He would eventually be inducted into the Rock-N-Roll hall of fame.
p8ADA TIL that San Francisco had an outbreak of BUBONIC PLAGUE in 1900–1904 that killed 119. While city officials acted quickly to contain it, California Gov. Henry Gage covered it up to protect the powerful railroads and other businesses. Some newspapers helped by defaming the city health commissioner.