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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.
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Jupiter, Saturn, Venus, Mercury, Neptune and Uranus will all be visible at same time in curved line across sky，详情可参考快连下载安装