In a nursing career, nurses provide education that helps clients change lifelong habits. Nurses communicate with people under stress: clients, family and colleagues. Nurses deal with anger and depression, with dementia and psychosis, with joy and despair. Nurses return to school to specialize, write grants for research proposals, and become entrepreneurs. Nurses become administrators, leaders, case managers, infection control specialists, quality experts, and educators. Nurses cross international boundaries to share knowledge needed to promote worldwide health. Nurses must be assertive to ask the right questions and make their voices heard.