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Abnormal polarity of thunderclouds grown from negatively charged air.
Moore CB, Vonnegut B, Rolan TD, Cobb JW, Holden DN, Hignight RT, McWilliams SM, Cadwell GW. Moore CB, et al. Among authors: mcwilliams sm. Science. 1986 Sep 26;233(4771):1413-6. doi: 10.1126/science.233.4771.1413. Science. 1986. PMID: 17830740