  We describe a new realization of supersymmetry, called scalar supersymmetry,
acting in spaces of differential forms (bi-spinors), where transformation
parameters are Lorentz scalars instead of spinors. The realization is related
but is not reducible to the standard supersymmetry. Explicit construction of
chiral multiplets that do not require doubling of the spectrum of a gauge
theory is presented. A bi-spinor s-supersymmetric string action is described.
