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What is that itch? What is lurking under the sheets in your bed and burrowing into your scalp? They are everywhere -- in your house, on your body. They use you for sustenance. Creepy? You bet. Learn more about these "creepy crawlers" in the Nova program Odyssey of Life: The Unknown World. Microphotographer Lennart Nilsson, famous for his extraordinary work in the Miracle of Life program, takes a close-up, never-before-seen look at the microscopic creatures that are very much a part of your everyday life.