I have absolutely zero knowledge about the science and/or biology of skin, I read your post expecting it to end with something stupid like "don't know, I made all of this up". I'm glad it didn't!

I love HN because, for every snarky comment that's made or said on a misunderstood, or incorrect basis of knowledge that would set off an alarm on QI, followed by a stern telling off by Stephen Fry.

There's some one like you, who has an endless pit of knowledge to aritculate or better inform with a whole lot of insight thrown in for good measure. Thank you, your post's awesome. :)

Small edit: I immediately thought "Your skin can't be that good as a barrier, nicotine and caffeine patches work through the skin?" when I saw the post you replied to, and loved that you made reference to it too.