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The discovery of several elementary particles has been associated with:
investigations of cosmic rays.
There are four types of interactions among particles:
gravitational, electromagnetic, strong and weak.
The electromagnetic interaction provides:
a force between two charges.
The weak interaction is always responsible for:
all radioactive decays.
There are two types of elementary particles:
quanta of force and matter particles.
There are two types of matter particles:
leptons and hadrons.
For every particles that exists in nature:
there is a corresponding antiparticle.
Note 
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