How do light bulbs work, and why do onions give you bad breath?
We explore the curious questions that science can answer
How do light bulbs work?
A light bulb contains a thin wire filament. When a current flows through this filament, the metal heats up and then glows, giving out light. As the inside of the light bulb is a vacuum, there’s no oxygen to oxidise the filament, so it lasts a long time.
How does a radiator work?
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