  A unified theory of all forces should be nonsingular. In such a unified
theory, Einstein's general relativity will be a very low curvature effective
theory. At larger curvatures, new terms will become important. The question
then arises as to whether it is possible to construct an effective action for
gravity which leads to a nonsingular theory. In this work, we construct an
effective action for gravity in which all homogenerous and isotropic solutions
are nonsingular. In particular, there is neither a big bang nor a big crunch.
Preliminary work indicates that our construction provides a theory in which
anisotropies decrease at large curvatures, and in which the inside of a black
hole is singularity free.
