Enlarge this image A man holds a sample of the opioid antidote Narcan during a training session at a New York City…
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Enlarge this image A sample of saliva can unlock details about a person’s genetic makeup. Andrew Brookes/Cultura RF/Getty Images hide caption toggle…
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Enlarge this image Millennials are more apt to treat low back pain themselves, and with treatments like exercise and massage. Getty Images/iStockphoto…
