 What best describes how the overall tone changed from the beginning of the article?
But, from what I hear, there are plenty of rock formations. He plastered some water on his dark-red hair, pushed a comb through it, and shrugged as it snapped back almost to its original position. It could start cavities. In fact, anything having to do with atomic science excited him. You couldn’t have a father who was head of the atomic-science department at Oceanview College without picking up a little knowledge along the way. Eddie knew that a radioisotope was a material which had been “cooked” in an atomic reactor until it was “hot” with radioactivity. When carefully controlled, the radiation stored up in such isotopes was used in many beneficial ways. One reason for asking that particular question was to keep from prying deeper into the subject of the radioisotope. His father usually volunteered any information he wanted known, so Eddie stuck to questions which could and would be answered. At the speed atomic science is moving today, we simply can’t afford to waste time. The best way to get there was by rowboat across Moon Bay, and that was too long a row to be starting now. They had been ever since Eddie’s family had moved to Oceanview and his father had become head of the college’s atomic-science department. Teena’s father was chief engineer for the Acme Aviation Company, one of the coast town’s largest manufacturing concerns. 22 “Oh, yes, it’s fun, Mother,” Teena replied, wrapping wax paper around a sandwich.
 From lighthearted to tense.
 From worrisome to frustrated.  From apathetic to solemn.  From lighthearted to tense.  From upbeat to sympathetic.