We’re surrounded by unseen worlds as complex and densely inhabited as the largest cities. Take a tour through two of these minute metropolises. Dust mites have taken over your home. Don’t think so? If you examined your pillow under a microscope, you’d find it to be three-quarters cotton and one quarter dead and living bugs. High above in the forest canopy, the wildlife’s really swinging - and we don’t just mean the monkeys. Meet the fungi, insects and other tiny denizens that truly rule this roost. Grade level 6 - 12. CC (26 minutes).