The Last Two Interactions

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So far, we have discussed gravitational force and electromagnetic force, two forces which have a major impact on our everyday lives. There are two other interactions which we don't notice since their range of effect is not much larger than the size of an atom nucleus.

We depend on these two forces for the existence of the stuff from which the world is made, and for the decay processes that make some types of matter unstable. They impact the smallest objects in the universe and the largest.


Smallest Largest
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We thank the Berkeley "Center for Particle Astrophysics" for the use of their dark matter images.