Now Demosthenes Kivotides, Carlo Barenghi and David Samuels at the University of Newcastle in the UK have discovered another surprising feature of liquid helium. They have predicted that the coupled motion of the normal and superfluid components can give rise to an intriguing structure that contains three vortex rings (Science 2000 290 777). In the […]
The so-called optical activity of materials has been studied extensively since then, so it is perhaps surprising that there is anything new to discover. However, José Goulon of the European Synchrotron Radiation Facility (ESRF) in Grenoble, France, and co-workers at the ESRF, the University of Paris and Purdue University in the US have recently observed […]
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