wind turbine - n. a tall structure that has large blades attached to an engine and that is used to produce electricity

physical therapist - n. a worker whose job it is to help people with physical pain or health needs

nurse practitioner - n. a nurse who is trained to do some of the things a doctor does -- such as give physical exams or order certain medical tests

encourage - v. to make someone more determined, hopeful, or confident

participant - n. a person who is involved in an activity or event

accelerate - v. to move faster

modest - adj. not very large in effect or impact

challenges - n. to test the ability, skill, or strength of someone

welfare - n. a program that provides financial assistance to very poor people