Explainer
What Is the Uncertainty Principle?
The uncertainty principle turns 100 next year, and it is probably the most misquoted idea in physics. Werner Heisenberg never called it a principle. The exact inequality in every textbook…
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zero-point energy
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Explainer
The vacuum is not empty. It is extremely busy.
Empty space has energy, structure, and consequences you can measure in a laboratory to twelve decimal places. Here is what the quantum vacuum does, what "virtual particles" actually mean, and…
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