  In a recent letter, henceforth referred to as Ref.[1], You et al postulate
that Bi2212 factually represents a series array of SIS junctions and claim that
the nonlinear current-voltage characteristics (IVC) of their bridge are free of
heating. Earlier experiments cast serious doubt upon the accuracy of the
principal postulate (of this letter), see Ref.[2] and references therein. In
what follows I will demonstrate that the major claim by the authors of Ref.[1]
is at odds with their own data which suggest an extrinsic cause for the IVC
nonlinearities.
