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You can watch the following animation to learn more about the basics of sound. Click the arrow to move on to the next slide. Acoustic levitation uses sound traveling through a fluid -- usually a gas -- to balance the force of gravity. On Earth, this can cause objects and materials to hover unsupported in the air. In space, it can hold objects steady so they don't move or drift. The process relies on of the properties of sound waves, especially intense sound waves. We'll look at how sound waves become capable of lifting objects in the next section. A basic acoustic levitator has two main parts -- a transducer, which is a vibrating surface that makes sound, and a reflector. Often, the transducer and reflector have concave surfaces to help focus the sound. A sound wave travels away from the transducer. Bounces off the reflector. Three basic properties of this traveling, reflecting wave help it to suspend objects in midair.|Former U.S. Presidents Jimmy Carter, George H.W. Bush, George W. Bush, Barack Obama and Bill Clinton all are eligible for generous benefits as part of the Former Presidents Act. People don't typically get into U.S. Sure, there are a lot of other prestigious perks that come along with a high-ranking position, but government jobs aren't typically known to be the most lucrative employment opportunities. And let's be real: The true "value" of public service has seen better days. Take the U.S. president, for example. While the annual salary ($400,000) dwarfs that of the median American income ($59,039), but it's not much more than a top-tier tech executive in the Bay Area ($316,763). So while a hefty paycheck may not be the most impressive piece of a politician's profile, aren't you a little curious what some government officials make? And how long do they have to work before they're paid for life (because that's a thing)?




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