› added 2 years ago

149

Today I learned that the light from white LED streetlights is turning purple in many places.

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via reddit.com

5Y7JP TIL there is a book called "Foundations of Mechanical Accuracy" that explains the process of how to get current tools from nothing. [PDF]
nWvmW TIL Velcro is actually called hook and loop. Velcro is a name brand, like Kleenex.
R7Oe4 TIL the words "female" and "male" are etymologically unrelated. "Male" is derived indirectly from the Latin "masculus" meaning masculine, and "female" is derived from the Medieval Latin "femella".
b6pe7 TIL that 70 year old Robert Maudsley has been kept in a solitary confinement cell designed specifically for him since 1983, after committing three murders while already locked up for that same crime
LkLXv TIL: The Ancient Sumerians worshiped a goddess named Ninkasi. The goddess of beer.