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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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siftDown(arr, i, 0); // 对剩余i个元素重新建堆
Dury said it was a "battle against time" to get the picture, which he captured using a wide lens.