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TIL that television ads can use inaudible sound to link your phone, TV, tablet, and PC. Companies can track what commercials you see, how long you watch it, and whether you act on the ad by doing a web search or buying a product.

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neAJG TIL a large amount of Japanese companies are owned by 'Keiretsu', mega conglomerates of companies historically run by families. One of these Keiretsu, Sumitomo Group, owns Mazda, NEC Corporation, and Nippon Steel, and traces its history back to a Copper Refining business started 1615.
V4WQ TIL suicide is the number one cause of death for South Koreans aged 9-24. South Korea has the highest suicide rate in the developed world
xV7o7 TIL In 2016, Manchester United canceled a game and evacuated the stadium after a steward discovered a pipe bomb in the bathrooms. Fortunately, the bomb was a fake; it had been left there by the security team during a training exercise and forgotten.
1a9W TIL chest hair grows in mathematical patterns.
VMgK0 TIL That the experimental T-13 grenade of World War II was designed with a size, weight and shape similar to a baseball, thus making it easy for young American men to properly throw the grenade with both accuracy and distance.