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You get sad, that’s normal. But you’ve also noticed months-long changes in eating habits and sleep patterns; you’re easily agitated and get angry quickly – and those may be early signs of depression. More than 17 million U.S. adults suffer...

You got a sunburn – no big deal. It was uncomfortable for a few days, but the pain subsided as your skin turned slightly darker. But what about the pain in your forearm? You don’t do any heavy lifting, weren’t...

The discovery and isolation of vitamin C were one of the most important advances in improving human nutrition. Scurvy, a severe vitamin C deficiency disease characterized by weakness, lethargy, easy bruising, and bleeding, was particularly problematic for sailors on long...