Newton's constant is one of the most fundamental and universal constants in nature, yet its accepted value is by far more uncertain than that of all the other physical constants. We have developed a new torsion balance technique, with many novel and remarkable features, that allowed us to determine G, and therefore the mass of the earth, with unprecedented precision. With another apparatus we are testing Newton's inverse square law at sub-mm distances to search for extra dimensions.

ANL Physics Division Colloquium Schedule