The question of whether a tree makes a sound if it falls in a forest with no one there to hear it is usually ascribed to the philosopher cleric Bishop George Berkeley, better known in mathematical circles for his attack on fluxions as 'the ghosts of departed quantities'. Apparently he never said it. But I was reminded of it on seeing one of BBC News' entertainingly bad headlines.It read: 'It felt personal': Si King on avoiding Sycamore Gap tree felling site until now
