  The simplest models might describe the nucleon as 3 light quarks, but this
description would be incomplete without inclusion of the sea of glue and q-qbar
pairs which binds it. Early indications of a particularly large contribution
from strange quarks in this sea to the spin and mass of the nucleon motivated
an experimental program examining the role of these strange quarks in the
nucleon vector form factors. The strangeness form factors can be extracted from
the well-studied electromagnetic structure of the nucleon using
parity-violation in electron-nuclear scattering to isolate the effect of the
weak interaction. With high luminosity and polarization, and a very stable beam
due to its superconducting RF cavities, CEBAF at Jefferson Lab is a precision
instrument uniquely well suited to the challenge of measurements of the small
parity-violating asymmetries. The techniques and results of the two major
Jefferson Lab experimental efforts in parity-violation studies, HAPPEX and G0,
as well as efforts to describe the strange form factors in QCD, will be
reviewed.
