Researchers at the University of California, San Diego have developed a porous silicon chip that can sniff out airborne chemicals. The US Department of Homeland Security says this could revolutionize protection against chemical weapon terror attacks.
Wisconsin recall election between Gov. Scott Walker (R) and Tom Barrett (D) enters its last furious week. It is a proving ground for the themes and players of the national election in November, analysts say.
What happens when ordinary people decide to pay it forward? Extraordinary change. See how individuals are making a difference...
Mae Azango has gone undercover to report on female circumcision, a rite of the Sande society in Liberia that is performed on young girls.
Mae Azango exposed a secret ritual in Liberia, putting her life in danger
When journalist Mae Azango wrote about a secret women's circumcision ritual in Liberia, she received death threats.
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