The discovery potential of the LHC depends sensitively on the input PDFs. Despite extensive efforts, the precision of the heavy quark distributions
have significant uncertainties. We illustrate some of these issues
for the case of the strange quark whose extraction is intertwined with
the corresponding nuclear corrections. The use of LHC W/Z production
data from both proton and heavy-ion beams could substantively improve
the precision of both the PDFs and the nuclear corrections.