The intensity distribution on a screen from dark to bright to dark again is called an interference fringe.

屏幕上的强度分布，从暗到亮再到暗，叫做一条干涉条纹。

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When people suffer from a migraine, they often retire to a cave-like dark room. But exactly why does bright light hurt the migraine sufferer?

偏头痛的时候，人们总是会缩在洞穴一般的小黑屋里，可到底为什么明亮的光线会让偏头痛者感到难受呢？

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These cells know which signal to send because they receive light input from our environments - bright says wake, dark says sleep.

这些细胞知道该打什么信号，因为它们从环境中接收到光线刺激，明亮时就表示人该醒着，昏暗时就该睡觉。

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Every year millions of water birds arrive from the Arctic to UK coasts, but until now scientists remained largely in the dark about how these birds respond to the bright lights of coastal cities and industry.

BBC: Grangemouth and Longannet lights help birds feed at night