What is Devil's Umbrella?
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Poison hemlock or water hemlock, Conium and Cicuta respectively. They are both deadly poisonous umbelliferous plants. The poisons in these plants act differently: Poison hemlock (the hemlock of Socrates' time) contains coniine, which causes ascending paralysis and suffocation, and water hemlock contains cicutoxin, which causes violent convulsions and nervous system collapse.
That's a devil's umbrella, Johnny. Don't even THINK of picking it!
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When a person (most likely a disgruntled student) takes a gun to school with the intention of killing multiple people in said school.
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A Uri Geller Smeller is named after the man who claimed he could bend spoons and stop clocks just by looking at them, and is the result ..