July 1990. The Pop Maths Roadshow comes to town. “Chaos” Rules OK.
28 July. Receive invitation to post-Pop Maths party in September. One of the conditions of eligibility to attend is to tackle four problems listed on the invitation. Surely only mathematicians do this sort of thing? I glance at the problems. Two of them I know how to tackle, and a third I haven’t a clue how to begin; but it is the first problem that intrigues me most.