In just a few years, every door lock, card reader, video camera, vehicle, power meter, and light switch will have an IP address — at least in the business world.

数年之内，至少在商业领域，每一个门锁，每一个读卡器，每一个摄像头，电表，甚至是电灯开关都会被赋予一个IP地址。

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A second of time, for instance, is now defined in terms of an electron transition of the cesium atom. And the meter is tied to the speed of light.

比如说，秒就是根据铯原子内部的电子跃迁时间来下的定义，而米的定义则和光速有关。

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Tip: For spark in a backlit portrait or silhouette, try compositions that include the light source. This can drive your meter crazy, though, so bracket your exposures.

小提示：在拍摄背光照明的人像或剪影时，试着将光源纳入构图中，但是这样会导致测光表读数不准，因此可以尝试使用包围曝光法。

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If it is a meter or more thick, however,blue light often can be seen.

VOA: special.2010.01.05

Instead of collecting light, the 25 meter wide telescopes collect radio waves.

VOA: special.2009.01.20

Light meter readings from volunteers have confirmed that the area already has some of the darkest skies in England.

BBC: Dark sky protection bid for Northumberland

What finally relegated your correspondent's Leica to the top shelf wasn't having to carry a separate light-meter all the time, but a pair of scissors as well.

ECONOMIST: A die-hard analog photographer goes digital

That might be about to change, though, as South Korea's state-owned Korea Electronics Technology Institute has announced a new image sensor chip that promises to take "vibrant photos" in extreme low-light conditions -- all the way down to 1 lux, which is the equivalent light output of a candle shining one meter away.

ENGADGET: South Korean image-sensing chip enables 1-lux photography