Clara Barton - Wikipedia -When she was 10 yrs. old, she assigned herself the task of nursing her brother David back to health after he fell from the roof of a barn and received a severe injury.[1] She learned how to distribute the prescribed medication to her brother, as well as how to place leeches on his body to bleed him (a standard treatment at this time.) She continued to care for David long after doctors had given up, and he made a full recovery.