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Four and a half billion years ago, the earth was formed. Perhaps a half billion years after that, life arose on the planet. For the next four billion years, life became steadily more complex, more varied, and more ingenious, until, around a million years ago, it produced mankind ― the most complex and ingenious species of them all. Only six or seven thousand years ago ― a period that is to the history of the earth as less than a minute is to a year ― civilization emerged, enabling us to build up a human world, and to add to the marvels of evolutions marvels of our own: marvels of art, of science, of social organization, of spiritual attainment. [大阪大]
参考: http://admiralty.pacific.net.hk/~paulchui/cosmic.html
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管理人
- 04/3/14(日) -
