  We show that there are several striking parallels between the dynamics of
gelatin gels and spin glasses. In general, glassy systems retain a memory of
their past history. A key characteristic differentiating spin glasses from most
other glassy systems is that on cooling they appear to "forget" what happened
just below the glass transition temperature, but the memory is recovered on
heating. We show that gelatin gels also behave in this way. Both systems show
critical scaling of the kinetics with temperature and undergo physical aging,
that is they never reach equilibrium, but continue to harden indefinitely at a
rate which is linear in log(time). The parallels between the dynamics of these
two completely different kinds of condensed matter strongly suggest that they
share an underlying theory.
