无人居住的空屋，墙上写着“人间烟火，生活如沸”。我刚走进，就被右侧树下突然窜出狂吠的大黑狗追着跑（图：南方人物周刊记者 刘璐明）
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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How many phones can you spot in this picture?