If There Was Any Doubt Of Labour's Anti...
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No best answer has yet been selected by justineo. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Try looking at this - it's a good description of how the cathode ray tube works, although a bit advanced for a young child.
stevie21 - that must be that foreign TV where all the people just say 'Ja!'
Here is a good link for explaining to children, even has some diagrams!
http://www.discovery.panasonic.co.jp/en/library/lib01elc/l01012.html