Number 32 (Story #5), May 1, 1991 by Phillip F. Schewe and Ben Stein POLARIZED ELECTRONS are used in particle physics, surface physics, and a number of other research areas where spin effects are important. A new source of polarized electrons, prepared by a SLAC-Wisconsin-Berkeley team, can achieve a polarization of 70%; the best previous value was 50%. In the new process polarized electrons are generated when laser light is aimed at a 0.1 micron thick sheet of InGaAs. (T. Maruyama et al., Physical Review Letters for 6 May.)