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New research in the August Issue of Physics Today explains how low-intensity electric fields can disrupt the division of cancer cells and slow the growth of brain tumors. The team of researchers used alternating electric fields that shift electric particles in cells back and forth hundreds of thousands of times per second. These low-intensity alternating electric fields were once thought to only heat cells but after several years of experiments, the researchers have shown the fields to disrupt cell division in tumor cells placed on a glass dish.