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TIL Pope Gregory IX's association of cats with witchcraft led to the wholesale slaughter of the critters, and some scholars believe believe that by the 1300’s, Europe’s cat numbers were sufficiently depleted to prevent them from killing rats and mice, allowing the bubonic plague to spread.

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LkVWP TIL Rep. Ed Orcutt suggested a CO₂ tax for cyclists/bikers because "they exercise and breathe hard and therefore exhale more CO₂", claiming biking is bad for the environment.
b9xKN TIL that sometime in the distant future (2 billion years) we’ll be able to view the Andromeda galaxy in our night sky as it gets closer and eventually merges with the Milky Way.
KOBNR TIL that Robert Morris, namesake of Robert Morris University, engaged in the trans-Atlantic slave trade and personally owned several slaves.
NDL8 TIL of a disorder called Aphantasia, people with it cannot see images in their head. Many that have this disorder are completely unaware.
JY4dB TIL humans have stripes on our bodies which are invisible to the naked eye, called Blaschko’s Lines