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TIL The television series 'Gunsmoke' stayed in the top 30 of Neilsons Media Ratings for an entire decade. Im learning about television ratings because they're meaningful to somebody that I despise.

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8aXA4 TIL there are about 1,500 species of cicadas known. There are those that appear yearly in midsummer, and there are also the so-called "periodic" cicadas. They appear at prime number intervals - 7 years, 13 years and 17 years. Once every 221 years, the 13-year cycle and 17-year cycle cicadas overlap.
LkOdd TIL that Disney artist and animator Ruthie Thompson, who worked on Snow White and the Seven Dwarfs (1937), is still alive today at age 107.
D1oQv TIL in 2017, in Scotland, two students entered an art gallery and, finding an empty table, placed a pineapple there to see if people would take it for art. When they returned 4 days later, the pineapple was covered with a glass protection.
e09A5 TIL Cows lick each other on the face and neck to say hello.
1ark7 TIL that Allied soldiers summarily executed guards at Dachau after discovering the concentration camp. Estimates vary as to how many but range between 35 and 50.