No one makes a revolution by himself; and there are some revolutions which humanity accomplishes without quite knowing how, because it is everybody who takes them in hand. ↗
As for sticking strictly to presently known science, I will simply point out that we have already experienced at least two major revolutions in science in this century alone. ↗
And lastly, the political revolutions from 1911 to the present time have done more to bring about tremendous social changes everywhere than even the economic and industrial changes and the new schools. ↗
Revolutions require work, revolutions require sacrifice, revolutions, and our own included, require a certain amount of rationing, a certain amount of calluses, a certain amount of sacrifice. ↗