  A recent analysis of cosmic-ray data from a space borne experiment by the AMS
collaboration supports the observation of an excess in the cosmic-ray positron
spectrum by previous balloon experiments. The combination of the various
experimental data establishes a deviation from the expected background with a
significance of more than four standard deviations. The observed change in the
spectral index cannot be explained without introducing a new source of
positrons. When interpreted within the MSSM a consistent description of the
antiproton spectrum, the diffuse gamma-ray flux and the positron fraction is
obtained which is compatible with all other experimental data, including recent
WMAP data.
