Stories on scientific themes, with afterwords by experts in each field.
It would have worked better had she approached more of the themes aslant, incorporating the science into the story, rather than addressing each topic head-on. Often they are wholly didactic with one character discoursing on the theme to another in "conversation" or letter. Then there is the pastiche of a "Just So" story which includes the phrase "endogenous opioid peptides"...