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Researchers find that man-made light from some electronic products at night may reduce the brain chemicals that help sleep.

研究人员发现，一些电子产品在夜间发出的人造光可能会减少大脑中有助于睡眠的化学物质。

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Many of the electronic devices we use every day, like our phones and computer screens, give off blue light.

我们每天使用的许多电子设备，比如手机和电脑屏幕，都会发出蓝光。

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Inside, photo-electronic cells read the light pattern and interpreted it as sound.

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That said, the 2% by volume that goes by air accounts for around 35% of the value: light, expensive goods such as high-end electronic components tend to be flown.

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Light-emitting diodes have progressed from simple red indicators on electronic products to become torches, streetlights and car headlights.

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