Tiny collapsing bubbles can focus acoustic energy into bursts of visible light. Careful measurements of the emitted light reveal extraordinary conditions at the centre of the implosion of a single bubble, but not so extraordinary as to support fantastical claims.
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Hilgenfeldt, S. Sound basis for light emission. Nature Phys 2, 435–436 (2006). https://doi.org/10.1038/nphys350
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DOI: https://doi.org/10.1038/nphys350
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