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TIL that the seasons in the Northern Hemisphere are the opposite of those in the Southern Hemisphere. This means that in Argentina and Australia, winter begins in June.

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xgXo TIL Alexander Graham Bell developed the metal detector as a last ditch effort to locate a bullet lodged in the chest of American President James Garfield in 1881; the attempt was unsuccessful because the metal coil spring bed Garfield was lying on confused the detector.
RW1w TIL an almost-invisible square metre sheet of graphene could be made into a hammock to hold the weight of a 4kg cat, despite weighing less than one of the cat’s whiskers
WkOYo TIL Human sperm can have antidepressant qualities
0w1py TIL Nakam was a group of about fifty Holocaust survivors who, in 1945, sought to kill Germans and Nazis in revenge for the murder of 6 million Jews during the Holocaust. Led by Abba Kovner, the group sought to kill 6 million Germans in a form of indiscriminate revenge, "a nation for a nation".
XEkr6 TIL that chewing gum is a synthetic rubber - polyisobutylene - and can be recycled into things like shoes, coffee mugs, pencils and rulers.