While returning to particle physics research, Oppenheimer also took an increasing interest in developing improvements in science education. He was eventually awarded a grant from the National Science Foundation to develop new pedagogical methods, which resulted in a "Library of Experiments"—nearly one hundred models of classical laboratory experiments which could be used in aiding the teaching of physics to elementary and high school children. These models would later become the core of the first exhibits at the Exploratorium. Oppenheimer also worked with the Physical Science Study Committee (PSSC), helping to develop a new high school physics curriculum in the immediate post-Sputnik years.