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Carp are a major food source, but they've been plagued by viruses. Scientists now say they have a simple solution. And along the way, they hit on an ancient commonality between fish and people.
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An analysis of global demographics indicates the maximum human life span may have peaked at around 115 years. That's despite medical advances and the occasional person who lives a few years longer.
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To stop open defecation, a U.N.-affiliated group takes villagers on a "walk of shame." But critics raise questions about the ethics of this approach.
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The U.N. has set the goal of eliminating extreme poverty and reducing the toll of disease by 2030. But there's a surprising obstacle.