  We explore the motion of a classical particle in a symmetric potential with
non-Gaussian skewed white noise. We show analytically and numerically that the
presence of nonzero odd moments leads to a macroscopic current. For a noise
with a vanishing third moment we find that the current changes sign as the
potential or the noise strength is increased. Possible physical situations are
discussed including motor-protein motion and driven systems like fluidized
beds.
