How many bottles of water does it take to replace a light bulb? It’s not a joke, there’s a genuine answer: one. Using humble water bottles to light homes is a real technology that is improving the lives of poor people around the world. A project called Liter of Light is helping to bring natural daylight to people living in makeshift, windowless housing by installing a litre bottle of water into a hole in the roof of their homes. The water bottle refracts sunlight and spreads it around the room, providing lighting up to the same level as that emitted by a 55 watt bulb. It is free to run and cheap to install, providing a renewable, sustainable and carbon-free alternative to traditional lighting.

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