Rice University physicist Christopher Tunnell, right, with co-worker Daniel Coderre of the University of Freiburg, Germany, at the XENON1T experiment beneath a mountain in Italy. The collaboration discovered that xenon 124 has the longest half-life ever measured in a material. The element’s half-life is many orders of magnitude greater than the current age of the universe. (Credit: Courtesy of Christopher Tunnell/Rice University)

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