  Much of twentieth century physics, whether it be Classical or Quantum, has
been based on the concept of spacetime as a differentiable manifold. While this
work has culminated in the standard model, it is now generally accepted that in
the light of recent experimental results, we have to go beyond the standard
model. On the other hand Quantum SuperString Theory and a recent model of
Quantized Spacetime in which, for example, an electron can be meaningfully
described by the Kerr-Newman metric, have shown promise. They lead to
mathematically identical spacetime-energy-momenta commutation relations, and
infact an identical non commutative geometry which is a departure from the
usual concept of spacetime. This could well be a new paradigm for the new
century.
