What is up you guys? What's another edition of controversial thoughts? This is my weekly

uh, soliloquy, solo, soliloquizing about a topic that I find interesting or that you

find interesting. Having just returned to Costa Rica from Austin, I thought I would talk

about skin, skin cancer, sunscreen, and connect it with linoleic acid, like so many things

in this video. This one gets me really excited. This is a really interesting rabbit hole

to go down. So come along on this journey with me. When I was recently in Austin, I was at

Barton Springs a lot. That's my favorite place in Austin because of the water and because

of the sun. And there were people spraying sunscreen on every freaking wear. It was very

difficult to sit anywhere and not breathe in other people's sunscreen. And I really

wanted to get up and shake people and say, do you know what is in your sunscreen? Because

multiple do not know what is in their sunscreen. So I will get to that. I will talk about what

is in main screen, uh, main stream, sunscreens in a moment. But first I want to start with

sunlight and our evolutionary connections with sunlight. Many of you know that I was in Africa

earlier this year, spending time with the HADSA. We got to see some Messiah and some

of the Toga. And there are good studies to show that the HADSA, some of the last remaining

hunter-gatherers in the planet as well as the Messiah, both which, uh, groups evolved in

Equatorial Africa and Tanzania, the Lake Easi region, end up with vitamin D levels that

is 25 hydroxy vitamin D levels in the blood of around 45 to 50. So we can say that that's

probably a normal level for humans. Now, they also did evolve more dark skin for that sun

protection. But those of us that are more fair skin can also deposit melanin in our skin

when we are exposed to more sun as a fluctuating adaptation. I am quite tan right now. And

when I was in Austin, many of my friends commented that I was very tan. This is because I spend

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