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Sheik Humarr Khan, one of the doctors fighting to control West Africa's largest Ebola outbreak, died Tuesday in Sierra Leone. He was 39.

After days of search and rescue efforts, U.S. Coast Guard officials have determined there was a "catastrophic implosion of the vessel," and that all on board died.

OceanGate's Titan submersible imploded on its way to the Titanic wreck one year ago. The Coast Guard initially had 12 months to complete its investigation, but says it needs more time.

NPR's Mary Louise Kelly talks with astrobiologists Catherine Neish and Kevin Hand about missions to Saturn's moon Titan and Jupiter's moon Europa, to search for conditions that could support life.

A floating digital billboard in the ocean off South Beach Monday afternoon aimed to make black visitors feel relaxed and at home at the beach. The...

Charities helping victims of last week's Indian Ocean earthquake and tsunami report receiving a huge outpouring of money from Americans. Some groups have been overwhelmed by the response, but all are heartened at the level of contributions. NPR's Libby Lewis reports.

NPR's Noah Adams speaks with NPR's Ira Flatow, host of Talk of the Nation Science Friday, about the successful flight of a NASA prototype "scramjet," an unmanned experimental aircraft with a revolutionary new air-breathing engine that achieved a speed of nearly 7,000 mph in a recent test mission over the Pacific Ocean.

This past April, a group of oceanographers was part of an expedition off the coast of the Northern Mariana Islands in the Pacific Ocean. They were studying various aspects of the Mariana volcanic arc. While on board their ship, they witnessed the underwater eruption of a volcano. NPR's Michele Norris talks with Dave Butterfield, one of the oceanographers who witnessed the eruption.

In the first of a two-part National Geographic Radio Expedition, NPR's John Nielsen reports from Peru on how road construction can hurt the rain forests. It happened in Brazil several years ago, when the Trans Amazonian Highway brought loggers and settlers into previously inaccessible parts of the jungle. Now, the Trans-Oceanic Highway could have similar results in Peru.

In the conclusion of a two part National Geographic Radio Expedition, NPR's John Nielsen reports from Peru on the mixed reactions to the Trans-Oceanic Highway. Nielsen completes his journey along the road and witnesses the hazards it has created for the people of the Amazon while establishing the jungle's only bridge to the 21st century.