evidence: There is a famous anecdote about Lewis Carroll and Queen Victoria: Victoria enjoyed Alice’s Adventures in Wonderland (1865) so much that she requested a first edition of Carroll’s next book. Carroll duly sent her a copy of the next book he published – a mathematical work with the exciting title An Elementary Treatise on Determinants. Unfortunately, like most good anecdotes, this one isn’t true, but such a story does highlight the oddness of Carroll’s double life. Carroll, despite the radical nature of his nonsense fiction, was a conservative mathematician and don at the University of Oxford, real name Charles Dodgson. [...] In finding herself in a completely mad world – full of tyrannical queens and mad hatters – Alice must learn to assert herself (something she does decisively at the end, when confronting the Queen of Hearts) and also, quite literally, keep her head about her while all about her are losing theirs (and often blaming it on her).