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Robert Plant's fascination with the blues goes back to his early days as lead singer for Led Zeppelin. Plant says the roots of that uniquely American art form may be traced to the deserts of Western Africa. He tells NPR's Renee Montagne about the connection he discovered at the Festival in the Desert, a gathering of nomads and musicians in Mali. Hear an extended interview and songs from the 2003 festival CD.

Black diamonds are extremely rare, and are found naturally only in Brazil and Central Africa. The cosmic origin theory of "The Enigma" is based on carbon isotopes and high hydrogen content.

The writer, poet, activist and musician joins Rachel Martin to discuss his latest album, the story of a hacker living in resource-rich Central Africa.

The National Geographic Society, in partnership with IBM, launches the "Genographic Project." More than 100,000 DNA samples, collected over five years, will trace the origin and movement of humans.

A rapturous reception as Pope Francis celebrates Mass with a million worshipers in the capital Kinshasa.

A rapturous reception as Pope Francis celebrates Mass with a million worshipers in the capital Kinshasa.

What would happen if Russia cut U.S. undersea telecom cables, as a New York Times report suggests? It may require a massive, hyper-organized operation to hurt Americans' access to the Internet.

NPR's Rachel Martin talks with Bethany Kraft, director of the Gulf Restoration Program at Ocean Conservancy, about the BP spill's impact on the environment to date.

July 2016 was Earth's hottest month on record. And Arctic ice has shrunk this year almost as much as it did in 2012 — the most severe melt to date.

Antarctica's ice is melting faster than was thought, say scientists who recently completed the most exhaustive assessment of the ice sheet to date.