Using quasars as standard clocks for measuring cosmological redshift
  We report hitherto unnoticed patterns in quasar light curves. We characterize
segments of quasars' light curves with the slopes of the straight lines fit
through them. These slopes appear to be directly related to the quasars'
redshifts. Alternatively, using only global shifts in time and flux, we are
able to find significant overlaps between the light curves of different pairs
of quasars by fitting the ratio of their redshifts. We are then able to
reliably determine the redshift of one quasar from another. This implies that
one can use quasars as standard clocks, as we explicitly demonstrate by
constructing two independent methods of finding the redshift of a quasar from
its light curve.
