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.
Instead of communicating in Morse code, fiber optics transmit information in bits. A laser at one end provides the light. A sensor at the other converts the signals into binary data. Some Internet service providers (ISPs) use fiber optics to carry data over their networks. A few provide fiber optic access up to customer homes, meaning those customers can enjoy blazingly fast Internet access. That's because unlike copper wire, which carries electrons to customers, fiber optics aren't limited by the restrictions of matter. Data can travel at the speed of light. A special chip is the center of the system. The chip can process multiple protocols. A protocol is a set of instructions that, in a way, are similar to languages. Devices that use a specific protocol don't understand other protocols. By building a chip that can process multiple protocols, Intel hopes to reduce the need for different types of cables and ports. The lasers that generate the light in Light Peak are vertical cavity surface emitting lasers (VCSELs).
You better be prepared before this guy comes to town. While watering the garden one spring day, your eyes turn skyward at the sound of distant thunder. Dark clouds are building on the horizon. You turn off the hose. Head inside to check the weather. As soon as you turn on the television, you're blasted with the ominous squawk of an emergency alert. Your pulse quickens as the list begins, and sure enough, you're in one of the threatened areas. Outside, the wind picks up as you plan your next move. Where is the safest place to be? Didn't someone say to open a window? Should you even be worried about the weather forecast? The rain intensifies. You try to remember what the police officer told you in that seventh-grade assembly, but to no avail. Before you can sort it all out, things suddenly take a turn for the better: The wind and rain die down, and the sun even peeks from behind the clouds.
You scan the area as the dust settles; it reveals nothing more than small fires where each of the armored vehicles had been just a moment ago. You exchange horrified looks with the remaining members of your platoon. It becomes excruciatingly clear to all of you that it's time to run. As you take a step or two, a brilliant light fills your sight. Eighteen miles away, the effectiveness of the attack is confirmed. Welcome to the United States Army's world of future combat. At the center of this vision for the immediate future is what took out you. Your caravan -- the non-line-of-sight cannon (NLOS-C). Capable of rapidly firing a number of different rounds -- from what appears to be out of nowhere -- the NLOS-C can accurately put the kibosh on enemy movement quickly, effectively and with decidedly less collateral damage. Read about this essential leap forward in American military firepower on the next page.
Acoustic levitation allows small objects, like droplets of liquid, to float. Unless you travel into the vacuum of space, sound is all around you every day. But most of the time, you probably don't think of it as a physical presence. You hear sounds; you don't touch them. The only exceptions may be loud nightclubs, cars with window-rattling speakers and ultrasound machines that pulverize kidney stones. But even then, you most likely don't think of what you feel as sound itself, but as the vibrations that sound creates in other objects. The idea that something so intangible can lift objects can seem unbelievable, but it's a real phenomenon. Acoustic levitation takes advantage of the properties of sound to cause solids, liquids and heavy gases to float. The process can take place in normal or reduced gravity. In other words, sound can levitate objects on Earth or in gas-filled enclosures in space.
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