" target="_blank" class="a2">http://www.physics.ucsb.edu/~jpierre/strings/susy.htm
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SUPERSTRINGS! Supersymmetric Strings
There are two types of particles in nature - fermions and bosons. A fundamental
theory of nature must contain both of these types. When we include fermions in the worldsheet theory of the string, we automatically get a new type of
symmetry called supersymmetry which relates bosons and fermions. Fermions and
bosons are grouped together
