THE ANAPOLE MOMENT OF A NUCLEUS IS DETECTED. Parity violation---the differentiation between left and right---was first observed (1957) in transitions between nuclear states. Later certain transitions in atoms too were seen to violate the conservation of parity. Now an experiment at the University of Colorado not only makes the most accurate measurement of this effect in cesium atoms but also observes, for the first time, the anapole moment for a nucleus, the internal electromagnetic moment in the nucleus which comes about because of the weak force. (C.S. Wood et al., Science, 21 March.)