On Friday's segment of NPR's Science Friday, they had as their "Video pick of the week" a proof that, at a certain speed, a well-designed bicycle does not need gyroscopic effect or trail to stay upright by itself. Thought folks on this list would like to see this. http://sciencefriday.com/program/archives/201104154
Also, in looking for the video, I found another article that goes into a bit more of the history of how one researcher came to design the bike in the video, and a bit more about previous research on bike stability: http://www.sciencenews.org/view/generic/id/72819/title/How_bicycles_keep_the_rubber_on_the_road Robbie Webber
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