Harley-Davidson's New Bike Hums, Instead Of Roaring

Harley-Davidson wants fans of motorcycles often called "hogs" to get to know its new electric bike that's quiet and has zero emissions.

Source: http://www.npr.org/blogs/thetwo-way/2014/06/19/323680257/harley-davidson-s-new-bike-hums-instead-of-roars?ft=1&f=1019

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