› added 1 week ago

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TIL that natural gas is actually odorless, and the smell we associate with it was invented in the 1970s by British engineer Peter Hansen. He was asked to create the "nastiest smell" possible so people could detect gas leaks.

Read more bbc.co.uk

via reddit.com

0da5y TIL the US Post Office issued stamp on 13 May 1918 to mark the first official airmail flight, featuring an image of a “Curtiss Jenny” biplane. A printing error caused the plane to be shown flying upside down. Only one "Inverted Jenny" sheet was printed, making those stamps extremely rare.
lop4r TIL that while we don't consider pig milk to be a viable product for humans, the most expensive cheese ever sold was from a swine.
M7VkV TIL While on the Moon, astronauts did not have any data to tell how long the small water tank used for cooling in their backpacks would last. After returning to and repressurizing the Lunar Module, they could drain and measure remaining water in the backpacks to confirm the predicted
XEenj TIL Fire hydrants are color coded for how many gallons of water per minute they can put out
4vP6 TIL Cartman killed his own dad. Scott Tenorman’s dad, Jack Tenorman, was Eric Cartman’s real father.