  The density of never changed opinions during the Sznajd consensus-finding
process decays with time t as 1/t^{theta}. We find theta ~= 3/8 for a chain,
compatible with the exact Ising result of Derrida et al. In higher dimensions,
however, the exponent differs from the Ising theta. With simultaneous updating
of sublattices instead of the usual random sequential updating, the number of
persistent opinions decays roughly exponentially. Some of the simulations used
multi-spin coding.
