'To the layman the difference between the description of an experiment and the actual witnessing of it is as great as the difference between looking at a foreign country on the map and visiting it; we grasp its geography in a far more vivid way when we have been to the place.
'One is struck again and again by the immense superiority, as judged by the effect on the audience, of a series of experiments and demonstrations explained by a talk over a lecture illustrated by slides. The Christmas Lectures to young people at the Royal Institution afford a good instance.
'It is surprising how often people in all walks of life own that their interest in science was first aroused by attending one of these courses when they were young, and in recalling their impressions they almost invariably say not 'we were told' but ‘we were shown’ this or that’ (Bragg’s own emphasis).
(*Advice to Lecturers: An anthology taken from the writings of Michael Faraday & Lawrence Bragg, London: The Royal Institution of Great Britain, 1974, ISBN 07201 04467).