Sounds & frequencies
This is where wellness marketing meets physics. We examine the colors of noise, the "healing frequency" claims, and the natural soundscapes — separating what the research supports from what's wishful thinking, always with the sources shown.
General information, not medical advice. Talk to a doctor about any health concern.
The colors of noise
White, pink, brown, and green noise — what each actually is, what the evidence shows for sleep and focus, and how to choose between them.
Read the cornerstone →All sounds & frequencies guides
The colors of noise
White, pink, brown & green noise — explained and compared.
Read → Evidence ReviewBrown noise & ADHD
What the research actually says — and the studies that don’t exist.
Read → SoundscapesNature sounds for relaxation
Rain, ocean & birdsong — the better-supported evidence, honestly weighed.
Read → Myth vs Evidence432 Hz vs 440 Hz
Is the "universe frequency" real? The cosmic claims, fact-checked.
Read → Myth vs EvidenceBinaural beats
Can two tones tune your brainwaves? The mixed evidence.
Read → Myth vs EvidenceSolfeggio frequencies
528 Hz "DNA repair" and the 1970s numerology behind it.
Read → Myth vs EvidenceGreen noise
The internet’s favourite sleep sound — and its missing research.
Read → Evidence ReviewTinnitus & sound masking
What the Cochrane evidence really shows — and when to see a doctor.
Read →The slow newsletter.
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