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Your Chance to Weigh In on the EPA's New Smog Proposal

Vaccine Opt-Out Rate Drops -- First Time Since 1998; Look Up Your Calif. School

Suspected Ebola Patient in Sacramento Tested Negative

Not Vaccinated? 'Stay Home from School,' Says Marin Dad of Leukemia Patient

Amnio Alternative: Blood Test Gives Women New Option for Prenatal Screening

Answers to Five Common Measles Questions

State Measles Cases Now at 73; Expect More

How Electric Light Changed the Night

This Year's Flu Shot Less-Than-Perfect, But Get It Anyway

California Unveils Strictest Rules on Pesticide

Disneyland Measles Cases Now at 26

23andMe Strikes Another Deal With Big Pharma

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