The brain may be master of all we do. But, at the tissue level, wonders are also to be found in those organs that we may think of as being more ordinary.

心脏负责为全身泵血，大脑指挥我们做一切事情，然而，就人体组织层面来说，在我们看起来非常普通的其它器官却也能看到它的奇妙。

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We're locked into it not just by day and night-there's the master timepiece in the brain called the circadian clock.

我们不仅按照昼夜的交替生活，而且还受大脑里的生物钟的支配。

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Humans are pegged to a 24-hour cycle. We're locked into it not just by day and night-there's the master timepiece in the brain called the circadian clock.

人类的生活周期是24小时，这个周期的形成不只是因为有白天和黑夜，它还与人脑内主要的计时器昼夜节律钟有关。

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So how can cells, which have the same sort of master information DNA, in your brain, and your heart, and your kidney be so different?

那么为什么这些有同种DNA信息的细胞,在你的大脑里,你的心脏里,在你的肾里,表现的如此不同呢

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Daylight is one of the key clues the master clock in the brain receives from the retina that it needs to resynchronize.

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Gene Block, a professor of psychiatry and biobehavioral sciences at University of California, Los Angeles, and colleagues found that by middle age, the signal the master body clock in the brain sends out to other internal clocks to help resynchronize the different processes gets weaker.

WSJ: To Avoid Jet Lag This Summer, Travel Like a Scientist