On Fri, 4 Jan 2019 08:37:24 -0800 (PST), wrote:

https://www.nature.com/news/the-bicy...matics-1.20281
Of course this isn't for John or Frank who could fall down if they were sitting on the ground.

It's the optional kickstand that keeps the bicycle upright.

Bicycle Dynamics
http://bicycle.tudelft.nl/schwab/Bicycle/

The Stability of the Bicycle by David L. Jones:
http://www.phys.lsu.edu/faculty/gonzalez/Teaching/Phys7221/vol59no9p51_56.pdf

How Do Bikes Stay Up?
https://www.youtube.com/watch?v=oZAc5t2lkvo (3:56)

Why bicycles do not fall: Arend Schwab at TEDxDelft
https://www.youtube.com/watch?v=2Y4mbT3ozcA (17:55)

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Jeff Liebermann
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