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TIL the manchineel tree, one of the deadliest plants on Earth, produces a sweet, apple-like fruit that’s highly toxic. Native to the Caribbean and Florida, its sap causes severe burns and blistering on contact, and even a taste of the fruit or inhaling smoke from its wood can be fatal.

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l56r TIL in the 1980s a man with severe OCD shot himself in the head in an attempt to commit suicide. Instead of killing him, the bullet destroyed the part of his brain that was responsible for his OCD, and he went on to become a straight-A college student five years later .
5V1gn TIL In China, there's a dish called Tong Zi Dan, where eggs are cooked in children's urine. Locals collect urine from kids in spring as a raw material. Surprisingly, these eggs sell for double the price of regular boiled eggs due to their cultural significance.
wLDYW TIL Spider-Man's trademark web-swinging technique in "The Amazing Spider-Man" was done using practical effects instead of the cgi used in the previous films. They built a giant rig that allowed a stuntman to swing from a thin cable attached to a winch over and through the real streets of NYC.
Z4kD TIL of James Fallon, a neuroscientist who studies serial killers, discovered a gene making someone pre-disposed to being a serial killer, then discovered that his brain is mapped very similarly to serial killers, he has the gene, and is descended from a long line of serial killers
VM7pD TIL that when Viagra is dissolved in water with flowers in them, the flowers stay erect up to a week longer than usual.