The Smithsonian Museum

Pictured are modern dolphins and an ichthyosaurus, an extinct marine reptile. Each came from a different land group, but independently they adapted to life at sea. image courtesy of Lindgren et. al, Nature Publishing Group

The repeated evolution of land creatures that move to the sea depends on changes in the marine environment

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A new species of mammal has been discovered in South America: it looks like a cross between a cat and a bear

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The space shuttle Atlantis lands at the end of mission STS-129, November 2009. Photo: NASA

NASA has reduced the prices of the shuttles

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