Contributions of strange quarks to proton structure

A number of measurements of elastic, parity-violating, electron-proton scattering have recently been completed and show some evidence for non-zero contributions of strange quarks to the ordinary charge and magnetization distributions of the nucleon. In this talk, I provide a brief review of the framework for, and description of, these experiments and discuss the results. The contribution of strange quarks to the magnetic form factor of the proton is determined to be -0.21 0.11 n.m. at Q² = 0.1 GeV², and there is a hint that the radius of the strange quark distribution is larger than that of the anti-strange quarks. These findings suggest, therefore, that the strange quarks in the sea interact in a non-trivial way with the other fields making up the proton.