05-08-2022, 06:26 AM
That last one costs around $300 new. In Ann Arbor, you check it out with your library card for free. “The library has had different unique items in its collection for now close to 40 years,” Parker reports. It started with framed art posters, which library patrons could borrow to brighten up their walls. “Those were considered expensive in their time. When Parker became library director 13 years ago, her only question was, what other kinds of unusual items can they lend out next? “What we decided to do was limit our scope to those things that someone might want to use occasionally, but wouldn't want to necessarily buy, or couldn't buy,” says Parker. “A telescope, for example. A family might not want to have one sitting in the basement all the time, only to take it out a couple times a year to look at the stars. But what if we were able to circulate them? 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. quien va ganando las elecciones
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