Watch: Crowds clash with police after Bolivian plane crash
After nine months in space, Nasa astronauts Butch Wilmore and Suni Williams have finally arrived back on Earth.。关于这个话题，91视频提供了深入分析
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Perhaps it’s the biggest question science has left to answer, how did life begin? Now, molecular biologists in Cambridge university have discovered tiny molecules of RNA which they say might provide some clues. Science journalist and author Philip Ball explains what we know and whether we’ll ever find the origins of life on earth.