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Selena Simmons-Duffin reports on health policy for NPR.

A crew of Icelanders sail across the ocean from their home to America 1,000 years after their Viking ancestors made the same voyage. Their vessel, the Icelander, is a replica Viking warship built to an ancient design by the ship's captain.

Linda Wertheimer talks with Joe Kunches, acting space weather operations director for the National Oceanic and Atmospheric Administration (NOAA), about unusual solar flares over the past few days. (4:00) www.sec.noaa.gov

Back in the seventeenth century, explorers told of seas teeming with giant marine creatures. A group of researchers concluded that these were an accurate account of life in the oceans at the time. As John Nielsen reports, these fabulous aquatic ecosystems collapsed as humans started to hunt these creatures.

NPR's David Kestenbaum reports that some NASA scientists think they've found proof of water on Mars. The team of researchers analyzed new photos of Martian canyons and found rock strata they say could once have been at the bottom of an ocean.

NPR's Madeleine Brand reports on some low-cost but high-tech and efficient building structures proposed to house refugees displaced by the Indian Ocean tsunami.

The Indonesian island of Nias appears to have taken the largest hit in Monday's Indian Ocean earthquake. Michele Norris talks with Jeremie Delage, an aid worker with Oxfam International, about the current situation.

Julie McCarthy has spent most of career traveling the world for NPR. She's covered wars, prime ministers, presidents and paupers. But her favorite stories "are about the common man or woman doing uncommon things," she says.

Homeowners in Briny Breezes, a small ocean-front mobile home community in Palm Beach County that sits on the Intracoastal Waterway, are said to be looking for a deal closer to $1 billion.

Trailer owners in Briny Breezes, Fla., thought they were about to become millionaires, but the prospective buyer of their prime location backed out of the deal. What caused the real-estate deal to sour?