Ten milestones that have helped to tell life's story:
-Walter Alvarez's asteroid theory of dinosaur extinction -The first identification of dinosaur fossils Stanley Miller's simulation of the early atmosphere, leading to organic compound formation -Robert Ballard's discovery of hydrothermal vent ecosystems -Charles Walcott's analysis of the Burgess Shale -The Linnaean classification system -Darwin's theory of natural selection -Donald Johanson's "Lucy" -Mary Leakey's Laetoli footprints -And Michel Brunet's Toumai skull
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