When your health insurer reclassifies a prescription drug you take from tier 1 to tier 2, it can sharply increase the portion of the drug's cost that you're expected to pay. Roberto Machado Noa/LightRocket via Getty Images hide caption

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Parkinson's disease, smoking, certain head injuries and even normal aging can influence our sense of smell. But certain patterns of loss in the ability to identify odors seem pronounced in Alzheimer's, researchers say. CSA Images/Color Printstock Collection/Getty Images hide caption

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A Sniff Test For Alzheimer's Checks For The Ability To Identify Odors

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Four sheep cloned from the same genetic material as Dolly roam the paddocks in Nottingham, England. The University of Nottingham hide caption

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'Sister Clones' Of Dolly The Sheep Are Alive And Kicking

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New drugs like Harvoni effectively cure hepatitis C, but they haven't yet been approved for use in children. Lloyd Fox/Baltimore Sun/TNS via Getty Images hide caption

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Natalie Dunnege and her son, Strazh, work on an art project at home in San Francisco. Her health insurance would cover therapy sessions to help with her depression, Dunnege says, but she hasn't been able to find a counselor who is taking new patients. Sheraz Sadiq/KQED hide caption

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Single Mom's Search For Therapist Hampered By Insurance Companies

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Wen cleansing conditioners combine the functions of a shampoo and a conditioner. The FDA says it is investigating consumer complaints about the products. Jesse Grant/WireImage for Kari Feinstein PR/Getty Images hide caption

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Health Officials Investigate Two Possible Cases Of Zika Virus Outbreak In Florida

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Every day, hundreds of patients wait to be seen at the Munhava health center in Mozambique's port city of Beira. Morgana Wingard hide caption

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The Sole Doctor In The Hospital Shoulders The Burden Of HIV

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Woman holding the dapivirine vaginal ring. Andrew Loxley/International Partnership for Microbicides hide caption

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The HIV Trap: A Woman's Lack Of Control

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Larry Smart, a Miami-Dade County mosquito control inspector, uses a fogger to spray pesticide to kill mosquitoes in an effort to stop a possible Zika outbreak in Miami. Joe Raedle/Getty Images hide caption

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Miami Steps Up Mosquito Control Efforts After Suspected Zika Cases

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Born This Way is produced by Jonathan Murray, the co-creator of MTV's Real World. Above, cast members Cristina Sanz (left), Rachel Osterbach, Steven Clark and Sean McElwee (top). Adam Taylor/A&E hide caption

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A Cast With Down Syndrome Brings Fresh Reality To Reality TV

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