Following Blumenbach's idea of races, Retzius suggested a using the ratio of skull width to skull length. An index of less than .8 was called dolichocephalic (long head) and greater was called brachycephalic (broad head). This failed attempt to split the human species into smaller groups only encouraged racism and ethnocentricity.
A visual chronology of Asimov's ~1500 scientific inventions and discoveries.
