ANTI-HYDROGEN ATOMS AT FERMILAB. Producing elementary anti-particles such as antiprotons and positrons is relatively easy. Producing anti-atoms, which are composite things, is harder. Both CERN and Fermilab have made precious small amounts of anti- hydrogen atoms by shooting a gas through an antiproton beam. Physicists naturally want to make measurements, starting with the cross section (the likelihood) for making the anti-atoms in the first place. In this case the cross section (using a data sample of 70 anti-H's) is about 1 pico-barn (the barn is a unit equal to 10^-24 cm²), about what theorists expected. Not much yet can be done to study individual anti-H atoms. In a proposed next-step experiment the anti-atoms (500-5000 will be needed) might be zapped with a laser as they escape. This would put the atoms into excited states. This would allow the first spectroscopic test of whether the rules of quantum mechanics apply equally to anti-atoms and conventional atoms. (G. Blanford et al., Physical Review Letters, 6 April 1998, contact David Christian at Fermilab, dcc@fnal.gov, 630-840-4001.)