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Water is a necessary resource for the health and survival of living things. But the availability of fresh water is decreasing for much of the worlds population. The United Nations estimates that about 3.6 billion people currently live in areas that f
Mike出差刚回来,被时差折磨得痛苦不堪,向同事Larry咨询缓解时差的好办法。Larry说, Larry: Some people take herbal medicine, but there's really no solid proof that it works. Some people take sleeping pills and try to sle
Scientists Testing Space Propulsion by Light 科学家测试太阳能动力 Can the sun provide power for a spaceship to travel to the edge of our solar system? The answer may come from a small satellite. A Delta V rocket carried the satellite into s
NASA Working Toward Mission to Mars The head of the National Aeronautics and Space Administration, or NASA, said that the space agency is on track to land people on Mars in the 2030s. Charles Bolden is the administrator for NASA. He said that five ye
Mike出差刚回来,被时差折磨得痛苦不堪,向同事Larry咨询缓解时差的好办法。Larry说, Larry: Some people take herbal medicine, but there's really no solid proof that it works. Some people take sleeping pills and try to sle