Read the excerpt from "Clara Barton’s Childhood.”For several weeks the sound of hammer and saw had been heard on the Barton farm where a new barn was being built. The framework was almost up. David Barton and his little sister Clara, with a group of friends, were eagerly watching the carpenters, who were just fixing the high rafters to the ridge-pole."I dare you to climb to the top, Dave!" suddenly challenged a boy in the group.Almost before the challenge had been given, his coat was off, and he had started toward the new building amid a chorus of cries: "Good for you, Dave!" from the group of young spectators who were always thrilled by his daring exploits.