Data transmission is realized by technologies common in everyday life including blue tooth, cell phone, infra-red, wifi, and wired technologies, all of which operate as part of a network.

通过技术实现数据传输常见于生活中的方方面面，包括蓝牙、手机、红外线、无线、有线技术，它们都作为网络的一个组成部分发挥作用。

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The other, which faces a specialised type of solar cell made of a material called indium gallium arsenide, is sculpted into a structure called a photonic crystal that causes it to emit infra-red radiation selectively at the frequency best absorbed by the cell.

ECONOMIST: Solar power

It transforms only around 0.1% of the infra-red light thrown at it into electricity (compared with 20% for an ordinary solar cell).

ECONOMIST: Monitor