Light Element Abundances
D:  Crucial.  Strong dependence on
baryon density.  Measured from
interstellar absorption in UV/Far-UV with
HST and FUSE.  Older values are [D/H] =
1.5 +/- 0.2 x 10-5, but we will have an
update based on FUSE results on high-
order Lyman lines by a volunteer.  Keep
in mind that stars destroy D, so these
numbers are lower limits.  Can also look
in the IGM using high-z quasars.