We study the topology of the space bd K^n of complete convex
hypersurfaces of R^n which are homeomorphic to R^{n-1}. In particular,
using Minkowski sums, we construct a deformation retraction of bd K^n
onto the Grassmannian space of hyperplanes. So every hypersurface in bd
K^n may be flattened in a canonical way. Further, the total curvature
of each hypersurface evolves continuously and monotonically under this
deformation. We also show that, modulo proper rotations, the subspaces
of bd K^n consisting of smooth, strictly convex, or positively curved
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