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Supertopics:
Bicycles / Cycling
Sudden Phase Changes (Bifurcation, Critical Mass, Tipping Points)

The Critical Mass Cycling Movement

Subtopics:
webTony BriscoeChicago Tribune2014-10-04
webScienceDaily2014-06-24
webBill ChappellNPR2011-02-28
webMichael Cabanatuan, Jaxon Van ...San Francisco Chronicle2007-04-05