IT IS getting ever trickier to find incandescent bulbs. Almost all rich countries are phasing them out because they squander so much energy as heat rather than visible light. But they have ardent fans ...
In space, light will go on, and on, and on… In a windowless room, where does the light go when we switch it off? Light is a pretty simple beast. In lieu of any interference, it will go on, and on, and ...
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