JOEL WILLIAMS, ASSOCIATE EDITOR [email protected]JAKE SALTZMAN, NEWS EDITOR [email protected]The properties and performance of semiconductor chips powering modern technologies are ultimately determined by free electrons. With the continued miniaturization of electronic and photonic devices, tools to examine the behavior of free electrons, simultaneously at the picosecond-time and nanometer-length scales, have become necessary. A method developed by researchers at the University of California, Berkeley is poised to allow more effective measurement of these electrons, opening paths to better energy efficiency. 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