Humans appear to have a reasonable amount of diversity in their sexual orientations, in what is often referred to as “gender” and in adult behavior generally. When convenient, people will point to “genes” as the “cause” of any particular subset of th is diversity (or all of it). When convenient, people will point to “culture” as the “cause” of … whatever. The “real” story is more complicated, less clear, and very interesting. And, starting now, I promise to stop using so many “scare” quotes.
A big todo was made a while back about the possibility of life based on arsenic. In science fiction we often see worlds created in which life is based on one strange thing or another. But years ago, Darwin found a place were life was based on the Booby. And the Noddy. Let’s not forget the Noddy.