  It is becoming possible to detect high redshift quasars in various molecular
lines, and to show by mapping lensed objects that the strong dust and molecular
emission arises in warm dense ~100 pc-scale "tori." The properties of ULIRGs,
at least those with AGN-like narrow line regions, are very similar, as expected
in the hidden quasar hypothesis. Several of the latter are in fact confirmed as
"Quasar 2s" by spectropolarimetry.
