Diarmaid MacCulloch's history of sex and Christianity touches on knotty issues such as the distinction between sex and gender ...

(More on that term later, too.) Believe it or not, many cultures throughout history have recognized non-binary identities, and those two "normal" options are actually a relatively recent invention.

The Theory of Equations: with an Introduction to the Theory of Binary Algebraic Forms. By W. S. Burnside A. W. Panton Fourth edition. 2 vols. Pp. xiv + 286 and xii + 292. (Dublin: Hodges ...