A New Solution of Einstein Vacuum Field Equations
  A new solution of Einstein's vacuum field equations is discovered which
appears as a generalization of the well-known Ozsvath-Schucking solution and
explains its source of curvature which has otherwise remained hidden.
Curiously, the new solution has a vanishing Kretschmann scalar and is
singularity-free despite being curved.
  The discovery of the new solution is facilitated by a new insight which
reveals that it is always possible to define the source of curvature in a
vacuum solution in terms of some dimensional parameters. As the parameters
vanish, so does the curvature. The new insight also helps to make the vacuum
solutions Machian.
