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Wednesday, October 28, 2026 · The Sunday letter

AudientConsciousness

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acoustics

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October 21, 2026
Light and sound locked together in a plain glass fibre
Max Planck physicists made light and sound waves trade energy faster than either fades, in one pass through a fibre at 4 K, with…
Explainers
October 10, 2026
What is a sound wave, and why 432 Hz is not magic
Pressure, frequency, amplitude and resonance in plain language, and why the 432 Hz and 528 Hz “healing tuning” claims rest on one small student…

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