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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.|Increased crop yields will affect global food supply and demand over the coming years, according to a new United Nations analysis. Global food commodity prices are expected to remain low over the next decade, because abundant supplies will combine with slower growth in demand in developing countries. That's the upshot of a report recently issued by the UN Food and Agriculture Organization (FAO) and the Organization for Economic Cooperation and Development (OECD), an alliance of 35 nations that looks after the well-being of people around the world. Instead, by 2026, when we'll have about 8 billion people on the planet, the average human will have regular access to an average 2,450 calories per day in the least developed countries, and more than 3,000 per day in developing countries. One reason Malthus was wrong: He didn't factor in that agricultural productivity would increase as the population grew. The FAO-OECD report notes that 90 percent of the projected increase in corn production, for example, will come from increased yields of existing plants, rather than planting on more acreage. Tesla Chief Executive Elon Musk, who has a long history of clashing with US safety officials, denied there was a safety issue with the function. Musk wrote on Twitter. But the carmaker nevertheless issued a software update to disable the function. NHTSA officials on Thursday said they would push for recalls if they feel safety risks may exist in any vehicles. Tesla has said it develops almost all its software to allow for regular over-the-air updates. The carmaker has issued software updates that control vehicle performance, braking, battery charging and infotainment functions. Tesla has led the auto industry in over-the-air recall updates. While nearly all recalls issued by NHTSA since 2020 required physical fixes, seven of Tesla's 19 recalls since January 2020, or 37 percent, were addressed with over-the-air software updates, an analysis of public data showed. Unlike traditional recalls that require a trip to the dealership, remote updates are cheaper and can ensure that all vehicles receive the required fix. camp

















































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