Some of the many different versions of string
theory attempt to unify all four fundamental
forces. The problem with any of these theories,
indeed the problem with string theory itself, is
that they make no predictions that scientists can
test. As a consequence, we have no way of knowing
if any version of string theory is even remotely
correct. As a result, string theory is more a
branch of mathematics than a branch of physics,
since we have no way of knowing whether it
describes a real or entirely fictional universe.
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