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![Boron nitride nanosheets [blue and white atoms] act as insulators to protect a barium nitrate central layer [green and purple atoms] for high temperature energy storage.](https://spectrum.ieee.org/media-library/boron-nitride-nanosheets-blue-and-white-atoms-act-as-insulators-to-protect-a-barium-nitrate-central-layer-green-and-purple-at.jpg?id=25581393&width=1200&height=900)
