David Astle is a full-time word nerd. Many will know him as the dictionary man on the TV show Letters and Numbers. Or maybe just DA, the devious crossword-setter in the Sydney Morning Herald and the Age. He also devises a weekly 'Wordplay' newspaper column, plus a newsy anagram game on Sunday radio. Between puzzles, he's written half a dozen wordy-nerdy books for adults, including Riddledom, Cluetopia and Puzzled.