http://www.engineeringinteract.org/resources/siliconspies/siliconspieslink.htm
http://www.bbc.co.uk/schools/scienceclips/ages/10_11/changing_circuits_fs.shtml
http://www.bbc.co.uk/schools/scienceclips/ages/8_9/circuits_conductors_fs.shtml
Thursday, 28 June 2007
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