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TIL Bruce Lee could deliver a blow in 5/10 of a second from a distance of one meter (and 8/10 of a second from a meter and a half). It's 1/20 of the time it takes for a person to blink. At the time the standard cameras couldn't cope with the speed of Bruce's blows. His strikes were not visible.

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PYLdV TIL that the Peloponessian War between Athens and Sparta only ended in 1996 - no treaty was signed when the fighting ended in 404 BC, so 25 centuries later the mayors of the cities signed a pact saying "Today we express our grief for the devastating war between the two cities and declare its end"
XEKx6 TIL: The ideomotor effect, that is our body moves when we are not trying to move. It's a powerful subconscious tool and is the mechanism behind how ouija boards work.
NXxl6 TIL Dutch historian Rutger Bregman spoke at Davos in 2019 to a roomful of rich people about the need for them to pay their fair share of taxes
ZpWyQ TIL the Nazis had an extremely successful leisure and vacation based organization that, by the time war broke out in 1939, had become the world's largest tourism operator. The year before, 1938, saw 10.3 million Germans take vacations paid for by the group.
oRjYR TIL about the Krill Paradox. Krill's chief predator are whales and as they've declined through hunting krill numbers have also paradoxically declined. Turns out, whale poo is a natural fertilizer for plankton (whale dung contains 10m times iron than sea water) which in turn are fed upon by krill.