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TIL that the hum from transformers is caused by magnetostriction, a process where the change in polarity through the core causes the core to slightly and rapidly expand and contract, making a vibration.

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rNd4d TIL of Ken Forsse, an Disney Imagineer whose company Alchemy II was put in charge of the animatronics on the Disney Channel show the Welcome to Pooh Corner. Nearly broke, the company switched to toys using the animatronic technology used in Disney rides. The result? Teddy Ruxpin.
Z8vQ4 TIL that rapper and entrepreneur"Berner" turned down $800,000,000 for his cannabis edible line "Cookies". Instead he took $10,000,000 for a 10% stake in his company.
b5K7 TIL there is a version of Pepsi available in Japan with 5 times the carbonation of regular Pepsi.
Jn51 TIL a Senegalese officer, Mbaye Diagne, drove hundreds to safety during the Rwandan Genocide when no other developed nation would. He died on a trip when a mortar hit his jeep.
lood1 The boomerang seems as Australian as ''Waltzing Matilda,'' but the oldest specimen may have come from a far distant part of the world -Poland. Scientists, there have found a 23,000-year-old piece of the curved mammoth tusk that some ancient artisan carved and polished into the aerodynamic shape of a boomerang.