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TIL about Emergence. Complex things happen when simple objects, rules or people interact. In the presence of a feedback loop, Emergent phenomena create Complex Systems like a Market or Fractals.

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neo4W TIL A house cat bit its owner in the middle of the night to alert the family for the house fire. The family got out in time with no injuries and the fire department confirmed the cat was partially responsible for the rescue, "Hero kitty"
R5Ln1 TIL that since 1937 the Isle of Man has only had one year where motorcycle races were held without fatalities (1982).
jGmN TIL that a man having a seizure on subway tracks was rescued by a stranger. The rescuer jumped down onto the man and compressed him down by laying on him as five cars passed over him.
VNlZ TIL that it is almost certain that the astronauts survived the initial Challenger explosion, and died on impact with the water. At least three of the crew’s emergency oxygen tanks were manually switched on after the crew’s capsule broke apart from the rest of the shuttle.
N7dbb TIL of a French soldier called Tarrare, who could eat a meal intended for 15 people in a single sitting, ate live cats, snakes, lizards and puppies. He would also sweat profusely and had an odor that was described as “fetid beyond all conception”.