Timeline of United States inventions (1890–1945) installing driven conveyor belts that could produce a Model T in ninety-three minutes. 1901 Safety razor (disposable) A safety razor protects the skin from all but the edge of the blade while shaving skin. King Camp Gillette, a traveling hardware salesman of Fond du Lac, Wisconsin invented the double-edged, disposable safety razor attached to a re-usable razor handle. Beforehand, dull razors were taken to barbers for sharpening. With Gillette's double-edged and disposable blades, a uniform shave on a man's face could be achieved with a fresh blade and disposed after it was used. Gillette applied for a patent in 1901.
Occam's razor Occam's razor Occam's razor (also Ockham's razor or Ocham's razor; Latin: "lex parsimoniae" "law of parsimony") is the problem-solving principle that the simplest solution tends to be the correct one. When presented with competing hypotheses to solve a problem, one should select the solution with the fewest assumptions. The idea is attributed to English Franciscan friar William of Ockham (c. 1287–1347), a scholastic philosopher and theologian. In science, Occam's razor is used as an abductive heuristic in the development of theoretical models, rather than as a rigorous arbiter between candidate models. In the scientific method, Occam's razor is not considered