In the Walking Out Graphs Lesson described here, students experience several types of representations used to describe motion, including words, sentences, equations, graphs, data tables, and actions. The most important theme of this lesson is that students have to understand the consistency among these representations and form the habit of…

The purpose of this article is to share a learning-cycle sequence of lessons designed to convey the particulate nature of matter through use of physical models and analogical thinking. This activity was adapted from Conceptual Chemistry, a long-running professional development program for teachers of grades 4-9. Conceptual Chemistry's approach is…

The United States has a significant deficit in the number of university students choosing to major in science, technology, engineering, and mathematics (STEM) and subsequently entering STEM professions (National Science Board 2008). One way to address this problem is to find ways to make STEM careers more interesting and intellectually accessible…