In one work, this thinker described scientific knowledge as “perpetual evolution” to rebut claims that only historians or psychologists should study the development of ideas. This thinker began theorizing about childhood mistakes in problem solving while working under Alfred Binet. This thinker explained the development of knowledge by discussing cognitive equilibration between two of his central concepts. Four of this thinker’s lectures appear in the book (*) Genetic Epistemology, named for one of his theories. This psychologist discussed “assimilation” and “accommodation” (10[2]-5[1])as two methods of adapting schemas to take in new information. A model established by this psychologist begins with sensorimotor and preoperational stages. For 10 points, name this Swiss psychologist who created a four-stage model of cognitive development. ■END■ (10[1])