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There's been increased demand for the endangered species' horn by some east Asians who believe it has medicinal properties.

The U.S. is calling for the president of Niger to be released after soldiers say they have seized power in a coup in the West African country.

The ELISA test can seek out the presence of hormones or viruses in a matter of minutes, replacing previous cumbersome and time-consuming methods. Co-inventor Eva Engvall, then a young graduate student in Stockholm, gave the test its name.

Epidemiologist and violence disruptor Gary Slutkin says perpetual cycles of violence are not inevitable.

Emma Stone, Ava DuVernay and Gael Garcia Bernal are among more than 2,000 who signed the petition.

The State Department has recalled the U.S. ambassador to Zambia, who faced a backlash from the host government after defending LGBT rights.

Chad, Niger and others began an offensive against extremist fighters in Nigeria. Renee Montagne talks to Comfort Ero, African program director for the International Crisis Group, about the offensive.

Greeks had to confront creditors with an untested leader at the helm, deal with more austerity measures, economic overhauls and take in thousands of migrants from the Middle East and Africa.

Instead of pushing for new gun laws, anti-gun activists want supporters to pull big gun retailers like Wal-Mart from their investment portfolios. But experts say it might not be effective.

Ebola virus in Sierra Leone is killing dozens by the week. Medical workers have responded by expanding a field hospital, taking extraordinary measures to contain infection.