Both these devices worked well in sunny climates; but in northern Europe, the sun may be hidden by clouds for weeks at a time, while temperatures vary not only seasonally but from day to night.

这两种装置在阳光充足的气候条件下工作良好；但在北欧，太阳可能一次被云层遮挡数周，而温度不仅随着季节变化，而且还随着昼夜变化。

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He continued: 'Thermoelectric devices convert heat to electrical energy and this can be from the sun or a drop in temperature such as day temperatures to night.

他继续说：“热电装置将热量转化成电能，这些热量可以来自太阳或者温差，比如白天到夜晚的温差。”

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He added, “It transforms the lives of women most of all because they get labor saving devices, they get lights so they can study at night, and it helps the kids with school.”

他补充说：“供电首先会改变妇女的生活状况，因为她们因此可以节省体力，晚上可以在灯光下学习；同时供电也有助于儿童的学业。”

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Slowing down light may have many practical uses in communications, signal processing, television displays and night-vision devices.

BBC: A Bose-Einstein condensate: It slows down light

After crawling through a small, pitch-black hole in the debris, making their way past sharp metal parts, pieces of office paper, and pulverized concrete, they use listening devices and night-vision cameras to search for anyone alive.

CNN: workers

For those late-night shoppers hoping these devices would be the miracle ride to lean and mean, Hirsh has this dose of reality: " If you take diet out of the picture, to lose one pound of fat, the average (160-pound person) would need one to nine months" (of working out regularly) on almost all of the devices they tested.

CNN: Recession-proof your fitness resolutions