by Sally Bjork
"'The light-producing dance of annihilation,'" mused Mark Kennedy, physics department employee, on September's clue. "Easy! It is a sculpture by a friend of mine, Jens Zorn," U-M emeritus professor of physics. The sculpture is "known as 'The Short, Rich Life of Positronium,'"wrote Jim Pluta. "I am delighted that we get to enjoy a bit of physics in 'I Spy!'"
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