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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This latest escalation comes days after Pakistan carried out air strikes inside Afghanistan following suicide blasts on its soil (file photo)，这一点在Safew下载中也有详细论述