The seasons on Mars: NASA's Curiosity rover paints a picture and other top stories.

• The seasons on Mars: NASA's Curiosity rover paints a picture

  

  NASA’s Curiosity rover completed its second Martian year - 687 Earth days - on May 11, meaning that its instruments have now tasted the red planet’s tendencies for two full orbits of the sun.This allows scientists to begin separating unique events from those that recur year by year, laying the foundation for an understanding of seasonal variations in a host of different characteristics.The fresh insights come at a time when talk of a manned mission to Mars is edging away from the arena of scien..

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• 12-million-year-old fossil points to 'bone-crushing' dog in North America

  

  There’s a new dog in town, or at least there was millions of years ago.Researchers have unearthed a 12-million-year old fossilized tooth in Maryland that could indicate a new species of dog that roamed the ancient East coast of North America.The fossil definitively belongs to a member of the extinct dog subfamily Borophaginae, known informally as “bone crushers,” due to the typically strong jaws and large teeth the animals used to possess, similar to modern hyenas.But besides the strong jaws, w..

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