地平线之过敏症·现代生活和我

Changes to the bacteria that live inside all of us are responsible for increasing the number of people with allergies, suggests new research. 　　(㊙)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...