Sadly the laptop's too small and Chrome's too power-hungry for solar power to be an option: ⅓m width * ¼m length * 158W/m2 solar = 13W out of 67W to run it, or 19%.
While I love being outside, I always wear hats, hoods and jackets to protect my skin.
Also cataracts would also be a problem.
Sitting in tree shade won't give you skin cancer.
https://jamanetwork.com/journals/jamadermatology/article-abs...
All you are doing is listing modern formulations, some of which are not even generally regarded as safe anymore.
The statement being made by others is that "ancients" applied a topical substance to protect their skin from harmful effects of the sun, most would call that sunscreen[0] but use whatever word you prefer.
> anything remotely close to the formulae we have today
No one is making this claim.
[0] https://dictionary.cambridge.org/dictionary/english/sunscree...
Sunscreen is a 20th century term, and modern sunscreen as we know it came into use in the mid-20th century.
That’s not our sunscreen.
https://www.cancerresearchuk.org/health-professional/cancer-...
I think the dangers of over exposure to the sun have long been known and only recent generations think shorts and T shirts in direct sun for long amounts of time is a good idea.
It works well but it would actually be nice to have polarized glasses that improve the situation instead of making it worse.