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.|Installing solar panels is a more costly project that will take time to pay dividends. See more green science pictures. Green construction has been around forever. For millennia, people routinely sited and built their homes to best take advantage of the sun's heat and light, for example, while various businesses and equipment were powered by water and wind. As the pressing need for these methods waned, we forgot about them. Today, green construction is increasingly incorporated into homes and businesses. But is it really the best way to go? It depends on the technology, the building and your needs. Before you automatically jump on the green bandwagon, consider a few things. And depending on which green features and materials you use, the payback can be relatively short or quite long. Many builders claim to build green, but they don't really know what quality green construction entails. If you want to build a truly eco-friendly house or commercial structure, you must take time to find someone who really knows what he's talking about. The NLOS cannon: The reason your day's about to take a turn for the worst. See more images of the Army. It's 2012, and you find yourself in the precarious position of being a soldier in a military that's embattled against the United States. The caravan of armored vehicles you're a part of comes to a halt. An unmanned aerial drone has just appeared over the horizon, flying toward the caravan. You and several members of your platoon are ordered out of your vehicle to destroy the reconnaissance drone. You look upward to the curious sight of several small parachutes suspending what looks like canisters, drifting toward the caravan. Strangely, despite a crosswind that should be carrying the canisters away, you notice that each one is headed directly for a vehicle. You hear someone shout "cluster bomb!" in your native language, followed by a body-rattling, quick succession of explosions. Your vision blurs, you hear only a single high-frequency note.|Many prefer threading for shaping their eyebrows because the technique is so precise. See more pictures of personal hygiene practices. One of the latest imports to the West is threading, a hair removal method that is catching the attention of many people, including celebrities. By most accounts, threading originated in the Middle East and South Asia. The technique involves using a thin piece of cotton thread. Swiping it quickly against the skin to remove hair at the root without taking any skin along. The procedure can only be done on flat surfaces of skin, which is why threading has not replaced waxing as the choice method of hair removal on the bikini line. Like waxing and shaving, however, threading does have the potential to cause infection, so you have to make sure you find a skilled practitioner who uses clean materials. You can usually find credible threading boutiques in most major cities. Read on to learn more about the history of threading, as well as its advantages and disadvantages.
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