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The results of two recent unrelated studies support the idea that dolphins may share certain cognitive abilities with humans and great apes; the studies indicate that dolphins are capable of recognizing themselves in mirrors—an ability that is often considered a sign of self-awareness—and of spontaneously grasping the mood or intention of humans.
Unlike the shuttle and earlier spacecraft, which were capable of carrying sufficient power in fuel cells and batteries for their short flights, a permanently orbiting space station will have to generate its own electricity.
Even though many of her colleagues were convinced that genes were relatively simple and static, Barbara McClintock adhered to her own more complicated ideas about how genes might operate, and in 1983, at the age of 81, was awarded a Nobel Prize for her discovery that the genes in corn are capable of moving from one chromosomal site to another.
Although the term “psychopath” is popularly applied to an especially brutal criminal, in psychology it refers to someone who is apparently incapable of feeling compassion or the pangs of conscience.
Though subject to the same wild-animal control efforts that killed off almost all the wolves in North America over the past century, the coyote, because of its amazing ability to adapt to the presence of humans, has been able to expand range into Alaska and Central America.
A new study suggests that the conversational pace of everyday life may be so brisk that it hampers the ability of some children to distinguish discrete sounds and words and, as a result, to make sense of speech.
Sulfur dioxide, a major contributor to acid rain, is an especially serious pollutant because it diminishes the respiratory system's ability to deal with all other pollutants.
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发表于 2010-9-14 10:28:15
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发表于 2010-9-14 11:32:38
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