A new study in the Journal of the American Geriatrics Society looked at this question by examining the personality characteristics of 246 children of people who had lived to be at least 100.

《美国老年医学会杂志》上发表的一项新研究通过考察246名孩子的性格特征研究了这个问题，这些孩子都是100岁以上老人的后代。

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Older people must be given more chances to learn if they are to contribute to society rather than be a financial burden, according to a new study on population published recently.

根据最近发表的一项关于人口的研究，如果老年人要对社会作出贡献而不是成为经济负担，就必须给他们更多学习机会。

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"I began to think of information as matter, and started to examine how it flows through people and through society, and how the availability of new information brings about change," he writes.

他写道：“我开始把信息当做一种物质，并开始观察它是怎样通过人们和社会流动，怎样能使新信息带来改变。”

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The checkpoints are not the only evidence of the new people-led society.

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Dr. Pagel's explanation is that, since language serves the interests of the group, when a new tribe splits off from the rest of a society, the people in the new tribe deliberately differentiate themselves the better to unite.

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"Some people were backing off at the same moment that there were other kinds of people who now recognized that King was not there for black people but for a new American society, " Harding said.

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