MAX ALEXANDER / SCIENCE PHOTO LIBRARY MAX ALEXANDER / SCIENCE PHOTO LIBRARY
Editorial use only.
David Keen, British physicist and president of the British Crystallographic Association. David Keen studies crystal structures that behave in unusual ways when their atoms become disordered; for example, substances which unexpectedly melt, change into a glass, or start conducting electricity. He is photographed on Porthcawl Beach, South Wales, where a pattern of holes in the sand around him portray the neutron diffraction pattern from a quartz crystal. Quartz is a common component of sand, and a subject of Keen's research.
Model release not available. Property release not required.