It is widely recognized that the United States needs to attract and retain more people in science, technology, engineering, and mathematics (STEM) careers. Intensive undergraduate research experiences (UREs) are one of the few strategies shown to improve longitudinal student interest and persistence in STEM-related career pathways; however, less…

Part One of this paper summarizes six years of investigations devoted to the study of the influence that a variable called teacher "wait-time" has on development of language and logic in children taking part in elementary science programs. It discusses the relation of wait-time to 10 outcome variables. Wait time at two locations was studied in…