The actuation of a biomimetic poly(vinyl alcohol)–poly(acrylic acid) gel

Abstract
A compilation of 17 observations of ball lightning showing the most energetic effects is presented along with estimates of their energy content. These observations were chosen from several thousand for the much stronger interaction of each ball lightning on its surroundings, and the method of energy estimation outlined. The case is put that some of the observations show a higher energy than self–contained chemical energy could provide.

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