The most important question for physics to answer is: What is matter made of? A glass of water or a chinch bug or a copper coin is composed of molecules. The molecules are built of atoms. Twenty years ago the ancient Greek notion persisted that atoms were indivisible. Then Ernest Rutherford of England split nitrogen atoms with atomic bullets from radium. Seven years ago physicists were willing to analyze all the matter in the universe in terms of two parts of the atom: protons and electrons.
Then, in quick succession two more particles were...
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