World News

Mohamud Saleh made his name by reducing crime in a lawless part of northeast Kenya. After an absence of more than a decade, he's returned to fight terrorism and argues the very same tactics will work.

Leaders of Tunisia's political factions win the Nobel peace prize for guiding the country through a political transition that's been a lot more peaceful than transitions in neighboring countries.

Before the Quartet was formed, Tunisia seemed doomed to walk the same path of violence, retributions and political chaos that had wreaked havoc in Egypt.

Negotiators reached agreement on a massive trade deal this week. It sets in motion a complex political fight — one that involves federal policy, the national economy, President Obama's legacy, and creates a backdrop for the 2016 presidential election.

David Christian explains the history of the universe from the big bang, and how humans occupy little more than a millisecond on that cosmic timeline.

Louise Leakey describes her family's long search for early human remains in Africa, and how unlocking that mystery is the key to understanding our past and our future.

Geneticist Spencer Wells describes how he uses DNA samples to trace our individual origins going back 2,000 generations.

Geneticist Spencer Wells tells the story of early humans, and our eventual migration from Africa.