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A nurse prepares a syringe for a measles vaccination at a pediatric clinic in Kiev, Ukraine. The country had 72,408 measles cases in the year from March 2018 to February 2019 — the highest number for any country during that period. Sergei Supinsky/AFP/Getty Images hide caption

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Sergei Supinsky/AFP/Getty Images

U.S. Measles Outbreaks Are Driven By A Global Surge In The Virus

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Combining some common antidepressants and opioids can undercut the relief of the painkillers. Daniela Jovanovska-Hristovska/Getty Images hide caption

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Daniela Jovanovska-Hristovska/Getty Images

Frank Lettiere's eyebrows and eyelashes froze after his walk along Lake Michigan's Chicago shoreline Wednesday. Frostbite warnings were issued for parts of the U.S. Midwest as temperatures plunged. Joshua Lott/AFP/Getty Images hide caption

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Joshua Lott/AFP/Getty Images

Medical Effects Of Extreme Cold: Why It Hurts And How To Stay Safe

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"There's a certain notion that e-cigarettes are harmless," says Dr. Paul Ndunda, an assistant professor at the School of Medicine at the University of Kansas in Wichita. "But ... while they're less harmful than normal cigarettes, their use still comes with risks." RyanJLane/Getty Images hide caption

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RyanJLane/Getty Images

Skeletal muscle cells from a rabbit were stained with fluorescent markers to highlight cell nuclei (blue) and proteins in the cytoskeleton (red and green). Daniel Schroen, Cell Applications Inc./Science Source hide caption

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Daniel Schroen, Cell Applications Inc./Science Source

Shoppers say they want simpler information to help them figure out which foods are healthy. But a one-size-fits-all solution may not work. asiseeit/Getty Images hide caption

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asiseeit/Getty Images

A scanning electron micrograph shows microglial cells (yellow) ingesting branched oligodendrocyte cells (purple), a process thought to occur in multiple sclerosis. Oligodendrocytes form insulating myelin sheaths around nerve axons in the central nervous system. Dr. John Zajicek/Science Source hide caption

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Dr. John Zajicek/Science Source