Here is an excellent little video on the Ford Model T, one of the great disrupters for personal transportation in the Industrial Age.
http://www.youtube.com/swf/l.swf?video_id=S4KrIMZpwCY
Note that the Model T's engine, 20 horse power, is not equivalent to 20 horses. It moves at 10 times the speed, due the difference in power density between engines and horses.
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