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TIL that lenses are called lenses because they resembled/resemble lentils.

https://en.wikipedia.org/wiki/Lens
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1gqp0of/til_that_lenses_are_called_lenses_because_they/

#TIL #todayilearned
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