Matter is what makes up all the stuff we can touch. In the standard model of particle physics, all matter is made of combinations of the twelve fundamental particles of matter. 260 more words
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In the mid 1920’s, Werner Heisenberg worked out a mathematical description of quantum mechanics.
One new concept he introduced was the uncertainty principle. This is the surprising idea that it is impossible to know with absolute precision both the position and the momentum of a thing, or to know the exact energy of a thing at a certain time. 246 more words