Changes to the bacteria that live inside all of us are responsible for increasing the number of people with allergies, suggests new research.<br>In this episode of Horizon, the show investigates this claim by conducting a unique experiment with two allergic families in order to find out just what it is in the modern world that is to blame. With a raft of mini cameras, GPS units an...
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2014-08-27
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HD
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选集播放
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