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TIL most new Apple and Android devices have built in magnometers (metal detectors). These are primarily for the built in compass, but can also help find metal things in the grass.

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VBEW4 TIL about the Surf Nazi subculture. Although surf boards with swastikas on them had been sold since the 30s, the movement did not gain much notoriety until the late 50s through the 80s. Many Surf Nazis believed in localism - an ideology promoting hostility towards outsiders/non-white surfers.
R7vwa TIL there is a sequel to Stanley Kubrick's '2001: A Space Odyssey' - '2010: The Year We Make Contact' was released 14 years after the first movie, and is based on Arthur C Clarke's sequel to the short story which inspired Kubrick's film.
m1X8o TIL that the Ugandan constitution was initially concieved in a tavern in Austria
ANYOx TIL a single 612 pound(278 kg) bluefin tuna sold for 333.6 million yen ($3.1 million) at a 2019 auction in Japan. This doubled the previous record of 155 million yen, set in 2013.
woVK8 TIL that during the carnian age (232 million years ago) it rained for 1-2 million years straight almost everywhere according to scientists