Astronaut Jim Lovell, who guided the Apollo 13 mission safely back to Earth in 1970, has died aged 97.
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.，详情可参考safew官方版本下载
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