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TIL that in 1975, after Gillette introduced a two-blade cartridge razor, Saturday Night Live aired a fake commercial for a three-blade razor. Gillette introduced one in 1998. In 2004, a satirical article in The Onion introduced a fictional five-blade razor. A real five-blade razor came out in 2006.

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awaxM TIL a man built the world's largest treehouse after claiming God told him to do so. It was 97 feet tall. It took 12 years to build and burned down in 15 minutes in 2019.
laBK TIL the han dynasty of China drilled for natural gas, tranposted it through pipelines and used it in stoves
7rGeZ TIL that in April 1917, the average life expectancy for a british pilot on the western front was 69 flying hours.
p8ar4 TIL In Africa and Asia, Panthers are black Leopards, whereas in the Americas, they are black Jaguars. Accordingly, Panthers are not actually a separate (or single) species at all, but melanistic variations of different big cats.
rR4Y4 TIL we tried fracking with nukes in the 60s, and only stopped because the gas was too radioactive to use