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filterfish

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My ex-partner has tinnitus and saw a psychologist who specialised in tinnitus. The psychologist suggested she buy a machine that generates a sound slightly quieter than her tinnitus which retrains the brain not to hear the tinnitus. So she bought a machine that generated about 15 different sounds and settled on a pink-ish sound and played while she slept. It took a couple of years but it effectively "cured" her tinnitus. It drove me mad for a while but after a while I didn't notice it.

The machine had different sounds because the sound of tinnitus is different for different people: hers sounded like cicadas, a sound I quite like but she hates!

I have misophonia and used to live in a house where a coffee van would start a generator at 0530 so I used a fan to help drown out the sound. I could still hear the generator but I could sleep through. It fundamentally changed the quality of my life.

I had a planter wart surgically removed which they packed with Manuka honey and because it's a deep open wound it needs to heal from the inside. I changed the dressing and repacked it every few days for weeks and the wound was absolutely pristine ever time.

I live in the tropics where people die because due to infection which makes it even more interesting that they use honey.

... closed-loop feedback systems ...

It's good to actually see even a mention of control theory.

My degree was electronics and control theory and whilst I've only had one job that involved either electronics or control theory I often think about software in these terms: I genuinely think that as an industry we need to seriously consider the systems we build in control theoretic terms.