We normally do everything we can to keep disease-causing bacteria out of our homes.
But millions of the micro-organisms could one day be harnessed to provide a natural light source running of nothing more than recycled household waste.
For electronics company Philips has devised a 'bio-light' that will provide any room in the house with a warm, cosy glow.
Given the green light: The bio-light emits a green glow from living bacteria
The lamp - consisting of a series of glass chambers - provides light using the same bioluminescent method as fireflies and glow worms.
The glass jars contain bioluminescent bacteria that emit a green glow when fed methane gas which, in this concept model is pumped into the lighting unit through a household waste digester.
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