Real lexical boundaries tend to vary where Dr Regier's algorithm produced several options that were almost as good as each other.

ECONOMIST: Psychology

Hendrik Lenstra, of the University of California, Berkeley, discussed with the assembled company one way to simplify and speed up Dr Agrawal's algorithm.

ECONOMIST: Number theory

Perhaps the most cunning use of an evolutionary algorithm, though, is by Dr Koza himself.

ECONOMIST: Monitor