  There is a convincing case for some form of supersymmetry, but conventional
supersymmetry has been plagued by many unsolved theoretical difficulties, and
not a single superpartner has been identified up to surprisingly high
experimental limits. These failures suggest that it is appropriate to rethink
the meaning of supersymmetry at the most fundamental level. Here we consider a
radically different form of supersymmetry, which initially combines standard
Weyl fermion fields and primitive (unphysical) boson fields. A stable vacuum
then requires that the initial boson fields be transformed into three kinds of
scalar-boson fields: the usual complex fields $\phi$, auxiliary fields $F$, and
real fields $\varphi$ of a new kind. The requirement of a stable vacuum thus
imposes Lorentz invariance, and also immediately breaks the initial susy --
whereas the breaking of conventional supersymmetry has long been a formidable
difficulty. Even more importantly, for future experimental success, the present
formulation may explain why no superpartners have yet been identified: Embedded
in an $SO(10)$ grand-unified description, most of the conventional processes
for production, decay, and detection of sfermions are excluded, and the same is
true for many processes involving gauginos and higgsinos. This implies that
superpartners with masses $\sim 1$ TeV may exist, but with reduced
cross-sections and modified experimental signatures. For example, a top squark
(as redefined here) will not decay at all, but can radiate pairs of gauge
bosons and will also leave straight tracks through second-order
(electromagnetic, weak, strong, and Higgs) interactions with detectors. The
predictions of the present theory include (1) the dark matter candidate of our
previous papers, (2) many new fermions with masses not far above 1 TeV, and (3)
the full range of superpartners with a modified phenomenology.
