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A bicycle, also called a pedal cycle, bike, push-bike or cycle, is a human-powered or motor-assisted, pedal-driven, single-track vehicle, with two wheels attached to a frame, one behind the other. A bicycle rider is called a cyclist, or bicyclist. Bicycles were introduced in the 19th century in Europe. By the early 21st century there were more ...
Advances in technology and science are often responsible for the coinage of retronyms. For example, the term acoustic guitar was coined with the advent of the electric guitar , [ 4 ] analog watch was introduced to distinguish from the digital watch , [ 5 ] push bike was created to distinguish from the motorized bicycle , and feature phone was ...
Snow Crash is a science fiction novel by the American writer Neal Stephenson, published in 1992.Like many of Stephenson's novels, its themes include history, linguistics, anthropology, archaeology, religion, computer science, politics, cryptography, memetics, and philosophy.
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Science fiction (sometimes shortened to sci-fi or abbreviated SF) is a genre of speculative fiction which typically deals with imaginative and futuristic concepts such as advanced science and technology, space exploration, time travel, parallel universes, and extraterrestrial life.
A bike can negotiate a curve only when the combined center of mass of bike and rider leans toward the inside of the turn at an angle appropriate for the velocity and the radius of the turn: θ = arctan ( v 2 g r ) {\displaystyle \theta =\arctan \left({\frac {v^{2}}{gr}}\right)}
E-bikes are classed according to the power that their electric motor can deliver and the control system, i.e., when and how the power from the motor is applied. Also the classification of e-bikes is complicated as much of the definition is due to the legality of what constitutes a bicycle and what constitutes a moped or motorcycle. As such, the ...
The Malloy Hoverbike, an early hoverbike, undergoing tethered hover testing in 2010. A hoverbike (or hovercycle) is a vehicle that can hover, resembling a flying motorbike, having at least two propulsive portions—one in front of and one behind the driver.