I do not see any reason to assume that the heuristic significance of the principle of general relativity is restricted to gravitation and that the rest of physics can be dealt with separately on the basis of special relativity, with the hope that later on the whole may be fitted consistently into a general relativistic scheme. I do not think that such an attitude, although historically understandable, can be objectively justified. The comparative smallness of what we know today as gravitational effects is not a conclusive reason for ignoring the principle of general relativity in theoretical investigations of a fundamental character. In other words, I do not believe that it is justifiable to ask: What would physics look like without gravitation?
Albert EinsteinRelated topics
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There is an enormous difference between modern science and Greek philosophy, and that is just the empiristic attitude... Since the time of Galileo and Newton, modern science has been based upon a detailed study of nature and upon the postulate that only such statements should be made, as have been verified or at least can be verified by experiment. The idea that one can single out some events from nature by an experiment... to find out what is the constant law in the continuous change, did not occur to the Greek philosophers. Therefore, modern science has from its beginning stood on a much more modest, but at the same time much firmer, basis than ancient philosophy. Therefore, the statements of modern physics are in some way meant much more seriously than the statements of Greek philosophy.
Werner Heisenberg
Woman must have her freedom; the fundamental freedom of choosing whether or not she shall be a mother and how many children she will have. Regardless of what man's attitude may be, that problem is hers; and before it can be his, it is hers alone. She goes through the vale of death alone, each time a babe is born. As it is the right neither of man nor the state to coerce her into this ordeal, so it is her right to decide whether she will endure it. That right to decide imposes upon her the duty of clearing the way to knowledge by which she may make and carry out the decision. Birth control is woman's problem. The quicker she accepts it as hers and hers alone, the quicker will society respect motherhood. The quicker, too, will the world be made a fit place for her children to live.
Margaret Sanger
Sam Treiman... has quoted something he called Treiman's theorem... Impossible things usually don't happen. ...With the discovery of radioactivity... it suddenly became apparent that the "impossible" was happening all the time. Uranium, thorium, radium... fit all the requirements of chemical elements. They could not be broken down by any of the standard methods... But occasionally... atoms of these elements spontaneously changed into other kinds of atoms. ...So what is left of the doctrine of the elements? Is alchemy reinstated? Not at all. The point is that the doctrine fails only under rare or special conditions. ...We can isolate the conditions in which they do, and retain a more restricted but still useful concept of the "impossible."
Frank Wilczek
The final result will be that the American people will ultimately prefer communities. They will cop out or opt out of the system. Today everything is a bureaucratic structure, and brainwashed people who are not personalities are trained to fit into this bureaucratic structure and say it is a great life--although I would assume that many on their death beds must feel otherwise. The process of copping out will take a long time, but notice: we are already copping out of military service on a wholesale basis; we are already copping out of voting on a large scale basis. ...People are also copping out by refusing to pay any attention to newspapers or to what's going on in the world, and by increasing emphasis on the growth of localism, what is happening in their own neighborhoods.
Carroll Quigley
Einstein is the only figure in the physical sciences with a stature that can be compared with Newton. Newton is reported to have said "If I have seen further than other men, it is because I stood on the shoulders of giants." This remark is even more true of Einstein who stood on the shoulders of Newton. Both Newton and Einstein put forward a theory of mechanics and a theory of gravity but Einstein was able to base General Relativity on the mathematical theory of curved spaces that had been constructed by Riemann while Newton had to develop his own mathematical machinery. It is therefore appropriate to acclaim Newton as the greatest figure in mathematical physics and the Principia is his greatest achievement.
Stephen Hawking
