单词：Gould, Stephen Jay
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HIV, the virus that causes AIDS, frequently mutates. That has allowed the virus to bypass the immune system and infect about 80 million people over the last 35 years. However, researchers say the rapid evolution of HIV actually may be reducing its ab
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??Forget about church, You're not going! Li's mother insisted angrily.You need to concentrate on your education and forget all this talk about religion. Li hung her head sadly and fought back the tears. She knew there was no way she could make her
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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Some people are worried that the more we learn about genetics, the closer well get to a day when we can choose all sorts of characteristics for our bab
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