Bill Clemens, who died peacefully of metastatic cancer at his home in Berkeley on Nov. 17 at the age of 88, became one of the most persuasive voices against the impact hypothesis. He represented many biologists and paleontologists who, seeing continual turnover of life in the fossil record, challenged the catastrophism of physicists like Luis Alvarez, geologists like his son, Walter, and, increasingly, the public, which found the impact hypothesis very compelling.

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