6 of 52: In this December, 2010 photo supplied Saturday, March. 24, 2012 by Victoria University in Wellington, New Zealand, New Zealand's Paul Callaghan delivers a speech during an awarding ceremony of Honorary Doctorate Degree. Sir Paul Callaghan, a top New Zealand scientist who gained international recognition for his work in molecular physics, has died after a long battle with bowel cancer. He was 64. (AP Photo/Victoria University) NEW ZEALAND OUT AUSTRALIA OUT EDITORIAL USE ONLY (AP Photo/ Anonymous)

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