Dogs had done what humans couldn't: they'd brought Jane and me together again.

It is one of survival, because rats have learned what humans couldn't.

Could humans, no matter how advanced in magic, live long in this poisonous atmosphere?

And never could humans have studied them as the machines did.

Most humans could only dream of being at the helm of their own ship.

No humans could, certainly, even if they wanted to do so.

Fortunately Vulcans could go a lot longer without sleep than humans could.

I thought skeldhiand humans couldn't, you know, make children?

Perhaps, since elves and humans could, and had, but what fate might such a child find?

His sense of hearing was enhanced in a similar manner, allowing him to hear sounds that humans could not.