I hate reviewing things. If you're not a trained and paid journalist then it comes across as a pretentious exercise. Nonetheless, I was writing an e-mail to someone who lent me David Nicholls' One Day and a brief exchange of thoughts became something denser and it got me thinking just how a book- not a movie or album- can become a significant cultural force. Most people I know don't read books but there are certain novels that really manage to extend their reach. One Day is most definitely that rarity: not just a novel but a story that readers' become possessive about.