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There’s a type of bacteria that infects caterpillars and produces a toxin that makes them lose all rigidity. The toxin is called MCF.
MCF stand for Makes Caterpillars Floppy
In quantum mechanics, there are types of vectors that are written like |a>, which is called a “ket”, and their dual vectors as <a|, which are called “bra”. You write the scalar product as <a|b>. This is called the Bra-Ket-Notation.