Word: ancestors
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...took tapes of Richard Feynman's lectures at Cornell, and they studied physics. And on a larger excursion with friends to central Africa, which ended at some beach cottages on an island off Zanzibar, among their companions was anthropologist Donald Johanson, known for his work on the human ancestor Lucy, who helped teach them about human evolution. In the evenings on each trip they would go to the beach with four or five other couples for bonfires, Hood Canal-style games and a tradition they called the sing-down, where each team is given a word and has to come...
...earliest occurred in October 1948, when Mary caught the glint of a tooth during an expedition to Lake Victoria's fossil-rich Rusinga Island. It was part of the jaw and skull fragments of a creature called Proconsul africanus, then widely thought to be a human ancestor (though now considered more closely related to the apes). The discovery made them so "exhilarated and also utterly content with each other," Mary wrote in her 1984 biography, Disclosing the Past, "that we cast aside care..." She gave birth to their third son, Philip, nine months later...
...later. While Louis lay feverish in his tent, she burst in, shouting "I've got him! I've got him--our man!" The find, consisting of two bulges of brown fossilized molars protruding from a slope, turned out to be the skull of a 1.75 million-year-old human ancestor the Leakeys called Zinjanthropus ("Man from East Africa"). The discovery, notes paleoanthropologist F. Clark Howell of the University of California, Berkeley, marked the start of "the truly scientific study of the evolution...
Eventually the Leakey partnership soured. When Louis died in 1972, they had been separated for three years--in part because of his philandering. Returning in 1978 to a site in Tanzania called Laetoli, Mary made what she considered the discovery of a lifetime: the unmistakable footprints of a human ancestor, possibly Australopithecus afarensis, in the region's 3.6 million-year-old volcanic ash. Not only were these hominids walking upright--rather than on all fours as apes do--but they were doing it much earlier than nearly everyone supposed and without the big brains long considered necessary for bipedalism...
...Gilbert's research does not yet conclusively prove that the common ancestor of modern life arose from the recombination of exons...