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Forty years after the Challenger disaster, NPR explores the engineers' last-minute efforts to stop the launch, their decades of guilt and the vital lessons that remain critical for NASA today.

A powerful winter storm walloped a huge swath of the U.S., killing at least 25 people. Electricity is out for hundreds of thousands, and freezing rain and snow have coated streets.

Museveni claims victory in Uganda's contested election as opposition leader Bobi Wine goes into hiding amid chaos, violence and accusations of fraud.

Reporters from across the NPR Network are covering the storm in each state — the impact and how officials are responding.

The return of the remaining hostage, Ran Gvili, has been widely seen as removing the remaining obstacle to proceeding with the U.S.-brokered ceasefire's second phase.