Every scientific law, every scientific principle, every statement of the results of an observation is some kind of a summary which leaves out details.
“The history of the development of technique, like the history of geographical expansion, has failed to provide us with a criterion of the growth of civilizations, but it does reveal a principle by which technical progress is governed, which may be described as a law of progressive simplification. The ponderous and bulky steam-engine with its elaborate ‘permanent way’ is replaced by the neat and handy internal-combustion engine which can take to the roads with the speed of a railway train and almost all the freedom of action of a pedestrian. Telegraphy with wires is replaced by telegraphy without wires. The incredibly complicated scripts of the Sinic and Egyptiac societies are replaced by the neat and handy Latin Alphabet.”