Propulsive Sting.

Researchers have been unsure of the exact mechanics of this blisteringly fast process, which occurs using special cell organelles called nematocysts. Now a team led by Matt Gibson and Ahmet Karabulut of the Stowers Institute for Medical Research in Kansas City, Mo., has used cutting-edge imaging technology to study nematocyst firing in very fine detail. BIOLOGY Jellyfish, sea anemones and corals, a group called cnidarians, sting with tiny, pressurized capsules that fire poisonous darts at explosive speeds. [Extracted from the article]

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