I have watched a seris of 3 clips on youtube, and have learnt about the history of radio. Even tho these video are out of date in style, however, the science is accurate and clear.
http://www.youtube.com/watch?v=3ehVVpY6XE4
http://www.youtube.com/watch?v=Zo7RIJn3e40
http://www.youtube.com/watch?v=1pTnaAq1y_g
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