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All the matter of the universe interacts in fundamental ways.
Explore the following paths that explain the matter of the universe!

The Standard Model Path: An introduction to the fundamental particles and forces.

The Experimental Evidence Path: Learn how physicists design and run those experiments which provide evidence for the Standard Model.

Beyond the Standard Model Path: While the Standard Model goes a long way towards explaining the "whys" of physical interactions, there are still many mysteries yet to be solved.

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Additional information on why atoms and particles decay.

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Copyright 1999 Particle Data Group.