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[AzetSar]

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. That seems almost miraculous in terms of what was required to make it happen. Next, we'll learn about the enormous undertaking of shooting on the "deserted" streets of Manhattan­. Matheson's novella is set in Los Angeles, but the movie takes place in New York City, which Lawrence thought made a more strikingly empty location. He estimates that there are about 830 special-effects shots in the film, but he didn't want to rely completely on computer imaging to achieve the ghost-town effect. So Lawrence set about filming on the streets of Manhattan. As you might imagine, this roused the ire -- and raised the middle fingers -- of some inconvenienced Manhattanites. But for Will Smith, that was a small price to pay. Lawrence cleared out an area outside Grand Central Station, Fifth Avenue and Washington Square Park for a driving sequence. The destruction of bridges and Times Square, of course, were computer-generated -- the only exterior shots that weren't live. Other than the occasional uncooperative individual, Lawrence says, people accommodated the production -- and the elements obliged, too. playboy nude

















































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