Jul 27, 2011

VOA Special English News 29

Human beings seem to be the only primate species whose brains get smaller as they get older. Scientists at George Washington University in Washington D.C. compared human brains with chimpanzee brains. Chimpanzees are the closest animal relative to humans. By age 80, the average human brain had lost 15 percent of its earlier weight. However, the chimpanzee's brains did not get smaller. Study organizers say the human brain might get smaller because it uses a very large amount of energy. Over time, they say, it can no longer work at same level.


*I have translated "Over time" into "時間の経過とともに", but I don't know it is a good translation. I am waiting for your suggestion.

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