A Quote by Edward Witten
As for the forces, electromagnetism and gravity we experience in everyday life. But the weak and strong forces are beyond our ordinary experience. So in physics, lots of the basic building blocks take 20th- or perhaps 21st-century equipment to explore.
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The 21st century will not be about the battle between capitalism and socialism but between the forces of progress and the forces of conservatism.
Superstring theories provide a framework in which the force of gravity may be united with the other three forces in nature: the weak, electromagnetic and strong forces. Recent progress has shown that the most promising superstring theories follow from a single theory. For the last generation, physicists have studied five string theories and one close cousin. Recently it has become clear that these five or six theories are different limiting cases of one theory which, though still scarcely understood, is the candidate for superunification of the forces of nature.
Our defence forces and their morale symbolise the prowess of the India of the 21st century.
The myth of self-sufficiency blinds us to the workings of other forces in family life. For families are not now, nor were they ever, the self-sufficient building blocks of society, exclusively responsible, praiseworthy, and blamable for their own destiny. They are deeply influenced by broad social and economic forces over which they have little control.
If we're to have a future in the 21st century, we'll want to be able to say, "Now what was the 20th century like in the United States of America, the most powerful of all countries of that century? What was it like to be an ordinary person?"
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A stable 21st century society requires 21st century solutions not 20th century economics
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I have begun to feel that there is a tendency in 20th Century science to forget that there will be a 21st Century science, and indeed a 30th Century science, from which vantage points our knowledge of the universe may appear quite different than it does to us. We suffer, perhaps, from temporal provincialism, a form of arrogance that has always irritated posterity.
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The pace of science forces the pace of technique. Theoretical physics forces atomic energy on us; the successful production of the fission bomb forces upon us the manufacture of the hydrogen bomb. We do not choose our problems, we do not choose our products; we are pushed, we are forced -- by what? By a system which has no purpose and goal transcending it, and which makes man its appendix.
Our design, not respecting arts, but philosophy, and our subject, not manual, but natural powers, we consider chiefly those things which relate to gravity, levity, elastic force, the resistance of fluids, and the like forces, whether attractive or impulsive; and therefore we offer this work as mathematical principles of philosophy; for all the difficulty of philosophy seems to consist in this from the phenomena of motions to investigate the forces of nature, and then from these forces to demonstrate the other phenomena.
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