THIS YEAR MARKS THE 100TH anniversary of the discovery of the electron by British physicist Joseph J. Thomson. But even a century later, after the world has been transformed by electronics, the electron is still an enigma: How can it have mass, as it does under some conditions, yet not occupy space under other conditions? Among the Web sites celebrating the continuing conundrum: http://www.iop.org/Physics/Electron /Exhibition and http://www.aip.org/history/electron.
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