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How is information stored on a CD?

How is a CD read?

Which emits the most radiation: a hot object or a cold object?

Which emits more radiation: a dull black object or a shiny bright object?

How is a piece of toast cooked?

What happens when microwaves interact with water molecules?

What happens to microwaves when they interact with plastics or metals?

Why are some people concerned about mobile phone masts?

Why are microwaves more dangerous than visible light?

How do microwaves cook food?