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Third, sound is a vibration that travels through a medium, like a gas, a liquid or a solid object. A sound's source is an object that moves or changes shape very rapidly. For example, if you strike a bell, the bell vibrates in the air. As one side of the bell moves out, it pushes the air molecules next to it, increasing the pressure in that region of the air. This area of higher pressure is a compression. As the side of the bell moves back in, it pulls the molecules apart, creating a lower-pressure region called a rarefaction. The bell then repeats the process, creating a repeating series of compressions and rarefactions. Each repetition is one wavelength of the sound wave. The sound wave travels as the moving molecules push. Pull the molecules around them. Each molecule moves the one next to it in turn. Without this movement of molecules, the sound could not travel, which is why there is no sound in a vacuum. Biden and other NATO allies have pledged to protect their eastern and central European members under the NATO treaty’s mutual defense commitments. The standoff between the U.S. Russia, two nations that command the world’s largest nuclear arsenals, has no modern precedent. Even during the Cold War, the nations’ military forces were never so closely positioned amid an active conflict. The volatile situation, and its unpredictable consequences, are precisely why U.S. European leaders spent months trying to stave off war. It remains unclear how far Russian forces are willing to go in Ukraine. ” He said he has no plans to occupy the country, but U.S. NATO officials say they need to be prepared, regardless of what the Russian president says. “Russia alone is responsible for the death and destruction this attack will bring, and the United States and its allies and partners will respond in a united and decisive way,” Biden said in a statement. Hours before the invasion started, Ukraine’s President Volodymyr Zelensky said in a speech that he had tried to initiate a phone call Putin on Wednesday but had been ignored.|On Aug. 20, 2008, Jamaican sprinter Usain Bolt broke the world record and won the gold medal for the men's 200-meter, with a time of 19.3 seconds at the Olympic Games in Beijing, China. Exactly one year later, Bolt broke his own record in Berlin with a time of 19.19 seconds the World Athletics Championships in Berlin, Germany. Jamaican sprinter Usain Bolt is the world record-holder in both the 100- and 200-meter, and winner of those events in the last three Summer Olympics. Bolt can hit a top speed of around 27 mph (43.5 kph), and has clearly established himself as the greatest sprinter of all time. But there's something curious about his legs, and the way he uses them. As the athlete prepares to run in his final world championship meet in London's 2017 World Athletics Championships, taking place Aug. 4-13 and less than three weeks before Bolt's 31st birthday, scientists are still trying to figure out just how the fastest human on the planet manages to achieve such incredible speed. who won debate

















































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