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The cruise ship Carnival Magic floats behind a catamaran off Cozumel, Mexico on Oct. 17. The ship skipped a planned stop there Friday, the cruise line says, after Mexican authorities delayed granting permission to dock. Reuters/Landov hide caption

itoggle caption Reuters/Landov

Meghan, 23, began experiencing hallucinations at 19. "Driving home, cars' headlights turned into eyes. The grills on the cars turned into mouths and none of them looked happy. It would scare the crap out of me," Meghan says. Marvi Lacar for NPR hide caption

itoggle caption Marvi Lacar for NPR

Avian influenza, or bird flu, causes an infectious and contagious respiratory disease. In the lab, several scientists have made the H5N1 strain more contagious, a controversial line of research. James Cavallini/ScienceSource hide caption

itoggle caption James Cavallini/ScienceSource

Ebola Virus, Transmission Electron Micrograph Of The Ebola Virus, Rna Virus, Cause Of Hemorrhagic Fever. BSIP/UIG via Getty Images hide caption

itoggle caption BSIP/UIG via Getty Images

Members of the California Nurses Association rallied in Sacramento, Calif., in May, in anticipation of contract negotiations with Kaiser Permanente that began in this fall. April Dembosky / KQED hide caption

itoggle caption April Dembosky / KQED

One rationale for extending Medicaid coverage to more people is to help them get to a doctor or clinic before a minor illness becomes a medical emergency. iStockphoto hide caption

itoggle caption iStockphoto

When people see charts like this, they think the drug is more effective than if they just read about the data, a study finds. Source: Cornell University hide caption

itoggle caption Source: Cornell University

A doctor uses a microscrope to view a human egg during in vitro fertilization (IVF), which is used to fertilize eggs that have been frozen. Mauro Fermariello/ScienceSource hide caption

itoggle caption Mauro Fermariello/ScienceSource

An ambulance carrying Amber Vinson, the second health care worker to be diagnosed with Ebola in Texas, arrives at Emory University Hospital in Atlanta on Wednesday. David Tulis/AP hide caption

itoggle caption David Tulis/AP

A man walks past the former site of a clinic that offered abortions in El Paso, Texas. Juan Carlos Llorca/AP hide caption

itoggle caption Juan Carlos Llorca/AP

A school official shows a pupil an infrared digital laser thermometer before taking his temperature in Lagos, Nigeria, in September. Starting this week, similar hand-held devices are checking foreheads for fever at some U.S. airports. Akintunde Akinleye/Reuters/Landov hide caption

itoggle caption Akintunde Akinleye/Reuters/Landov