Nurses are often called angels of mercy, because these individuals are the ones who take care of the sick, the elderly, and others who require some type of medical care. The nurses quotes that you can find online will show that many people go into this line of work because they want to help others and make people feel better. Nurses go to school to receive an education and training for this field, learning medical procedures and medications for years. In the USA some nurses may actually practice without a doctor present if they are qualified and licensed to do that. Some nurses also practice midwifery, delivering babies at home and taking care of mother and child. Nurses may choose to specialize in a specific type of care or provide medical care for many types of patients.