Quantum physics is the study of how the world works on the smallest scale, at a level far smaller than the atom. And as scientists studied the nature of reality on a smaller and smaller scale, something strange began to happen: The deeper we went into reality, the more it seemed to dissolve from view. The search for the smallest known particle of matter had instead turned up distinct yet elusive little packets of energy, which physicists called quanta.
The Einstein breakthrough comes down to this: Everything is energy. A rock, a planet, a glass of water, your hand, everything you can touch, taste, or smell - it's all made of molecules, which are made of atoms, which are made of protons and electrons and neutrons, which are made of nothing but vibrating packets of energy.
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