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First, gravity is a force that causes objects to attract one another. The simplest way to understand gravity is through Isaac Newton's law of universal gravitation. This law states that every particle in the universe attracts every other particle. The more massive an object is, the more strongly it attracts other objects. The closer objects are, the more strongly they attract each other. An enormous object, like the Earth, easily attracts objects that are close to it, like apples hanging from trees. Scientists haven't decided exactly what causes this attraction, but they believe it exists everywhere in the universe. Second, air is a fluid that behaves essentially the same way liquids do. Like liquids, air is made of microscopic particles that move in relation to one another. Air also moves like water does -- in fact, some aerodynamic tests take place underwater instead of in the air. The particles in gasses, like the ones that make up air, are simply farther apart and move faster than the particles in liquids. How much radiation do these machines produce? Is it enough to increase cancer rates in the general population? And can TSA agents see intimate details we'd rather they didn't? The European Union has addressed these questions decisively: It bans any body scanners that use X-ray technology. That ban complies with a law in several European countries that says people shouldn't be exposed to X-rays except for medical reasons. In the U.S., the TSA and the vendors that manufacture the scanners - such as Rapiscan for backscatter and L-3 Communications for millimeter wave -- continue to assure the public about the safety of the devices. And they've taken steps to protect passenger privacy by installing software that either creates generic outlines of people or blurs certain regions of the image. Still, many people remain skeptical that airport scanners, in any shape or form, are completely safe. And many more feel a bit lost trying to understand how the machines work and how they're different. brenton tarrant

















































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