National Geographic : 1988 Sep
S190 origins, reportingsince September 1960 190 on theirfossil discoveries in EastAfrica. Louis and Richard(left) examine fossils Tracingthe family of man, Louis S. B. found at Lake Rudolf, Kenya. At Laetoli, Leakey, his wife, Mary, and son Richard near Tanzania'sOlduvai Gorge where have pushed back the horizon of human Louis and Mary made many of their dis coveries, Mary uncovered 3.7-million year-oldfootprintspreserved in volcanic ash. That long ago moment, re-createdby an artist,appearedin the April 1979 issue. Among the many protigeesof Louis Leakey were premierfield researchersin primate behavior:Jane Goodall, who discovered that chimpanzeesfashion tools (andmake war); BirutiGaldikas, who found that orangutansare also tool users; andDian Fossey (right), whose murder by an unknown assailantin 1985 ended 19 years ofpioneeringgorilla studies.