Imagine somebody tells you they have an idea for a revolutionary new bicycle. Except it has a gas engine. And headlights. And can be driven at up to 35MPH. You might - mistakenly! - contend that what this person is talking about is in fact a motorcycle, and that it already exists, and why on earth would you invent a motorcycle with skinny bike tires, a tragically low top speed, cantilever brakes, and no sprung suspension (concerns of cost aside)?

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