Hank continues his primer on the strongest of the four fundamental interactions of physics, the strong interaction. Today he talks about the nuclear force and a force carrier called a pion.
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References:
http://science.howstuffworks.com/environmental/earth/geophysics/fundamental-forces-of-nature2.htm
http://hyperphysics.phy-astr.gsu.edu/hbase/particles/expar.html#c1
http://cronodon.com/Atomic/Quark.html
