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Think of it as a gift within a gift. Some beneficial gut bacteria contain viruses called "bacteriophages." And some of these phages now have been associated with good intestinal health in humans.
Serious algae outbreaks have hit more than 20 states this summer. Algae blooms aren't unusual. But the frequency, size and toxicity now are worse than ever, and changes in climate are partly to blame.
The actor and writer who brought his signature manic energy to comedy classics died at his home in Stamford, Conn., of complications from Alzheimer's disease. He was 83.
The focus has often been on U.S. military action in the Middle East. But diplomacy is also critical. Here's a look at one of America's most important and complicated relationships in the region.