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...
演员：Travis Rice 杰里米·琼斯 Mark Landvik Ben Ferguson Eric Jackson Bode Merrill Victor de Le Rue Bryan Iguchi Shin Biyajima Pat Moore Mikkel Bang Cam FitzPatrick