Aristotle classified living things by how much air, water, earth, or fire they possessed. The Gilbert and Sullivan operetta The Pirates of Penzance brought us animals, vegetables, and minerals. It took a former cobbler's apprentice named Carl Linnaeus to give us the current system that organizes every living thing on earth. This week's show talks about how that's done--and gives us a pretty cool mnemonic to remember it by. 

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