Then, in the 1970's, another young scientist, Michael Kaplan discovered neurogenesis (the birth of new neurons) in the brains of rats.

70年代，另一位年轻的科学家，迈克尔 卡普兰发现在大鼠脑中存在神经再生现象（即神经元细胞新生）。

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The answer has been lurking around in the scientific literature since the 1970's when Michael Kaplan reported that an enriched environment enhances the number of new neurons.

其实这个答案一直潜藏在科学文献中，70年代，卡普兰就报道了丰富的环境可以提高神经元的数目。

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Michael Kaplan, president and CEO of AIDS United, which supports more than 400 grassroots organizations annually, said that as a young gay man he found it difficult to talk to his doctor about HIV testing.

CNN: Why youths aren't getting tested for HIV

CNN's Michael Martinez and Brittany Kaplan contributed to this report.

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