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Nearly half a billion people get malaria worldwide each year. More than a million die. After decades of neglect, the world is renewing its fight against the disease.
Embryonic stem cells may someday help doctors treat ills ranging from paralysis to diabetes. But science must contend with politics before that hope can be realized.
In Southeast Asia a virus that kills chickens is now also killing people. And in those deaths, public health experts hear the distant rumbling of a global catastrophe.