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Award-winning historian David McCullough dead at 89
McCullough is best known for his Pulitzer Prize-winning presidential biographies "Truman" and "John Adams."
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CDC updates website, says claims about vaccines not causing autism are not 'evidence-based'
“HHS has launched a comprehensive assessment of the causes of autism, including investigations on plausible biologic mechanisms and potential causal links,” HHS spokesperson Andrew Nixon said
