For much of man’s history on earth, he had two choices for getting around, either on foot or on the back of an animal (such as horses, mules, and wooly mammoths). Bicycles were developed to add another transportation option that multiplied human efficiency by a factor of approximately five.
But the history of bicycles is very fuzzy. Sources often disagree as to the names of the inventors and the dates of their inventions. Leonardo DaVinci sketched a facsimile of the modern bicycle in 1490. It was way ahead of its time and, as far as we know, never left the drawing board.