Bicycle

A bicycle, pushbike, or bike, is a pedal-driven land vehicle with two wheels attached to a frame, one behind the other.

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Matter & Energy

First introduced in 19th-century Europe, bicycles evolved quickly into their familiar, current design.

Numbering over 1,000,000,000 in the world today, bicycles provide the principal means of transportation in many regions and a popular form of recreational transport in others.