It’s hot out. Be glad that you’re a human being, and not some other kind of mammal.
He thinks they should be inside the body, not outside.
Our planet’s view of the sun is critical to life, obviously, but equally critical is that it’s a shielded view.
Remember CHONPS — the acronym you learned in high school to remember the elements most important for life?
More detail has come out on the fascinating role of water in cellular dynamics, touched on by Denton in his book, The Wonder of Water.