The classification of life, starting with Aristotle's attempts. Botanist Carl Linneaus worked out a system in 1735 whose primary categories are still in use. From largest to smallest, here is how we fit them: * Kingdom: Animalia (animals) * Phylum: Chordata (with nerve chords) * Subphylum: Vertebrata (and backbones) * Superclass: Gnathostomata (and jaws for biting) * Class: Mammalia (the young feed on mother's milk) * Order: Primata (primates * Suborder: Haplorrhini (dry-nosed) * Family: Hominidae (erect, walking mammals) * Genus: Homo (humans and their close relatives, all now extinct but us) * Species: Homo sapiens (this two-name genus/species form is called binomial nomenclature)