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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.
Reports of African men being attracted to Russia by promises of jobs and ending up on Ukraine’s frontlines have become more frequent in recent months, creating tensions between Moscow and some of the countries involved.。一键获取谷歌浏览器下载是该领域的重要参考