The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.
大脑就像肌肉。当它被使用时，我们感觉很好。理解是快乐的。
-- Carl Sagan 卡尔·萨根
The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.
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The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.
大脑就像肌肉。当它被使用时，我们感觉很好。理解是快乐的。
-- Carl Sagan 卡尔·萨根
