Hacker News Reader

This is called "cold branding" and is used to brand/tag furred animals like wild horses. It is more humane than hot irons and the brands are easier to read at distance, but it isn't exactly pain-free.

Yes, that's it. I was mostly thinking about its use on humans. A friend of mine has a white patch on his chin and I mentioned he can even it out with dry ice.

My hair recently went significantly less white - a significant fraction of the hairs that I vainly plucked because they were white at the tips were dark at the roots. It correlated with a significant change in diet to eat more healthily, but I've noticed it happen before so it may also be seasonal or related to some other factor such as how stressed I am or how well I am sleeping.

Maslow's stuff and maybe some CBD. Stress is a killer.

Yeah entering middle age with white hair adds ten years of age.