Dec. 12, 2013: A bicycle fitted with a prototype of the Copenhagen Wheel, the red disk, a human/electric hybrid bicycle engine, hangs on a wall at Superpedestrian, the hybrid engine's manufacturer in Cambridge, Mass.  (AP Photo/Stephan Savoia)

Mass. high-tech startup hopes to change biking

CAMBRIDGE, Mass. (AP) — A Massachusetts startup is launching a new device that transforms almost any bicycle into an electric-hybrid vehicle using an app on a smartphone. The device, called the Copenhagen Wheel, is installed […]



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