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Health worker Jackie Carnegie delivers a rubella vaccine in Colorado in 1972. Ira Gay Sealy/Denver Post via Getty Images hide caption

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Ira Gay Sealy/Denver Post via Getty Images

Western Hemisphere Wipes Out Its Third Virus

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NASA Spacecraft Crashes Into Mercury, Concluding 4-Year Study Of Planet

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St. Agnes Hospital in Baltimore is one of the 131 hospitals run by Ascension Health. It's a not-for-profit, Catholic health care system that treats many low-income patients. St. Agnes Hospital hide caption

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St. Agnes Hospital

Drought In Calif. Creates Water Wars Between Farmers, Developers, Residents

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Rod-shaped specimens of Yersinia pestis, the bacterial cause of plague, find a happy home here in the foregut of a flea. Fleas can transmit the infection to animals and people, who can get pneumonic plague and transmit the infection through a cough or kiss. Science Source hide caption

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Science Source

Small Plague Outbreak In People Tracked To Pit Bull

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This image of a "red spot" on Mercury, which is thought to be the result of a volcanic explosion, was sent to Earth by the Messenger probe in 2011. NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington hide caption

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NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

Dr. George Papanicolaou discovered that it was possible to detect cancer by inspecting cervical cells. The Pap smear, the cervical cancer screening test, is named after him. American Cancer Society/AP hide caption

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American Cancer Society/AP

An artist's rendition of the HD 7924 planetary system — just 54 light-years away from Earth — shows newly discovered exoplanets c and d, which join Planet b. Karen Termaura, BJ Fulton/UH IfA hide caption

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Karen Termaura, BJ Fulton/UH IfA

Welcome To The Neighborhood: 2 Super-Earths Discovered

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Florida state Senate president Andy Gardiner, R-Orlando, was applauded by his fellow senators Tuesday, after expressing his disappointment with the Florida House for ending its session three days early, instead of working through the budget clash. Steve Cannon/AP hide caption

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Steve Cannon/AP

Florida's House Quits Early, At Impasse Over Medicaid Expansion

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Geologists Warned That Huge Quake Could Strike The Himalayas

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