› added 1 year ago

88

TIL 20/20 Vision doesn't mean you have perfect vision - it means your vision is normal, and you can see at 20ft what an average person can see at 20ft. The ideal is 20/15, which means you can see at 20ft what an average person can see at 15ft.

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9Y5y6 TIL that even though Johnny Cash's first wife was Italian-American, black and white photos in the 1960s misled some people into believing that she was black, which led to protests, death threats, and cancelled shows
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QNJ9 TIL that placing a stamp upside down means “I love you.” Stamp orientation has conveyed protest and secret messages for decades across the world.
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