The boy became volubly friendly and bubbling over with unexpected humour and high spirits. He tried to persuade Cicely to stay away from the ball-room for a fourth dance. Nobody would miss them, he explained.
 Drawings and pictures are more than mere ornaments in scientific discourse. Blackboard sketches, geological maps, diagrams of molecular structure, astronomical photographs, MRI images, the many varieties of statistical charts and graphs: These pictorial devices are indispensable tools for presenting evidence, for explaining a theory, for telling a story.