This article intends to present a bird's-eye view of the new aspects which elementary particle research has created recently and to show how they fit into the framework of physics of this century,nIt is generally maintained that high-energy physicists discover one new particle after the other;the number of "elementary" particles is said to be over ^0 now. One longs for the days, 25 years ago, when matter consisted of protons, neutrons and electrons (with an occasional appearance of a neutrino) and when one could explain anything, from astro¬nomy to physics and ohemistry, or even biology, on the basis of these few elementary constituents and the forces between them.
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