Abstract
We give examples of string compactifications to 4d
Minkowski space with different amounts of supersymmetry that
can be connected by spherical domain walls. The tension of these
domain walls is tunably lower than the 4d Planck scale. The
``stringy'' description of these walls is known in terms of certain
configurations of wrapped Dirichlet and NS branes. This construction
allows us to connect a variety of vacua with 4d 
= 4,3,2,1
supersymmetry.
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