<rt id="mjy0c"></rt>
    <s id="mjy0c"></s>
        <source id="mjy0c"><nav id="mjy0c"></nav></source>
        <tt id="mjy0c"><tbody id="mjy0c"></tbody></tt>
            <cite id="mjy0c"></cite>

            <rt id="mjy0c"><optgroup id="mjy0c"></optgroup></rt>
          1. 人類的壽命極限在逐漸延長
            文章來源: 文章作者: 發布時間:2007-09-22 08:41 字體: [ ]  進入論壇

            Pushing Life's Limits



            September 29, 2000

            John R. Wilmoth, a demographer(人口統計學家) at the University of California, Berkeley, has collected a wealth of data on humankind's increasing longevity(壽命) over the past two centuries. And this week in Science(美國《科學》雜志), he has some good news: The maximum average age we can reach too is on the rise. This finding contradicts the common scientific belief that life span has a biological upper limit of 120 years or so. "Whether 115 or 120 years, it is a legend created by scientists who are quoting each other," Wilmoth says. (He is shown at right with Christian1 Mortensen, who died in 1998 at the age of 115.) 

            Working with colleagues in the U.S. and Sweden, Wilmoth scrutinized(仔細審查) the Swedish national death records--considered the best in the world--from 1861 forward. They found that ages at death had shifted upward for 138 years--a trend that accelerated in the 1970s. Although some scientists presumed the larger number of very old people in later years was due simply to a larger population base, the new data show the main cause is actually increased survival after age 70. "We have shown that the maximum life span is changing," Wilmoth adds. "It is not a biological constant."


            1 Christian KVByl     
            • They always addressed each other by their Christian name.他們總是以教名互相稱呼。
            • His mother is a sincere Christian.他母親是個虔誠的基督教徒。