The Standard Model (SM) of particle physics is known to be incomplete.
Extensions to the SM, such as weak-scale Supersymmetry, posit the
existence of new particles and interactions that are asymmetric under
time-reversal (T), and nearly always predict a small, yet potentially
measurable (10-27-10-30 e.cm) electron electric dipole moment (EDM, de).
The EDM is an asymmetric charge distribution along the spin that is also
asymmetric under T.

About five years ago, ACME, a collaboration between groups at Yale and
Harvard universities (http://www.electronedm.org), embarked upon an
improved search for the electron EDM. Using the polar molecule thorium
monoxide (ThO), we have now measured de =(-2.1+-3.7stat +-2.5syst) X
10-29 e.cm. This corresponds to an upper limit of |de| < 8.7 X 10-29
e.cm with 90 percent confidence, an order of magnitude improvement in
sensitivity compared to the previous best limits. Our result constrains
T-violating physics at the TeV energy scale.