Switzerland has issued a postage stamp honoring the 50th birthday of CERN, the particle and nuclear physics laboratory on the Swiss-French border. The stamp, for overseas letters, marks the start of a series of events celebrating the lab’s first half-century. A recap of the scientific milestones and a schedule of events planned in CERN’s 20 member states is available on the Web at http://info.web.cern.ch/info/ES/CERN50. A commemorative monthly calendar can also be downloaded from
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