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TIL in 1920, the American Institute of Electrical Engineers met to try to find a way to measure power in a 3 or more phase electrical system. They did not reach a consensus until 1993.

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GLB1 TIL that after San Francisco’s ban on plastic bags, death from foodborne illnesses increased by 46% in the city.
Z8d9p TIL that Frida Kahlo grew up during a revolution, and the nationalism that followed would inspire her art.
j6xWR TIL the reason nearly all TV and radio political ads in the United States include something like "I'm _ and I approve this message" is because an act from 2002 requires it
jNJGp TIL: After Pearl Harbor, all U.S. currency in Hawaii was replaced with specially marked bills in case the Japanese seized the island.
L88d TIL Billiards is called “Pool” because of horse race poolrooms. In the 1800s betting parlors were called poolrooms, “pool” referring to a collective bet. Billiard tables were installed in poolrooms for people to pass time between races. Eventually the phrase “shooting pool” meant playing billiards.