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Do you use Velcro to secure any of your tools or power cords? Here's a close view at what the stuff really looks like when it's just about to close. The nylon hooks on the top dig into the coiled fibers below. The fibers hook into the loops. When you pull the two sections apart, the fibers slice through the hooks, thereby producing that infamous ripping sound. Some of you may find a striking similarity between this creature and the last helper you hired, but this is simply a 1,000 times magnification of a common household dust mite. The serrated front claws are for collecting flakes of human skin; his body is armored against attack. If a house has too much moisture and too little ventilation, these guys can multiply like crazy and produce an allergic reaction