It is one thing to learn a new piece of information, such as a new phone number or a new word, but quite another to get your brain to file it away so it is available when you need it.

学习新知识——比如记个电话号码或者一个新单词——是一回事，而将它们存进大脑并在需要时调用就完全是另外一回事了。

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In one set of experiments, they looked at brain slices to measure the number of specific receptors, or binding sites, that had moved to synapses.

通过一系列的实验，他们观察脑切片中所测量到的移动至突触的特定受体或集结区域的数量。

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Number one, you're busy with many other things. Number two, your brain has a capacity limit . And above all, your time: Life is short.

一来你们有好多事要忙，再说你们头脑的容量有限，更何况人生苦短，所以我才鼓励大家都去学英文。

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Now, researchers have found that eating chocolate, the number one food craved by American women, causes the brain to release endorphins, chemicals that make us feel good.

CNN: Researchers say chocolate triggers feel-good chemicals