In 2000 or so, Texas invented "Integrated Physics and Chemistry," a reinvention of what some folks called "High School Physical Science." It was a huge change, because it required more content than the traditional H.S. Physical Science course, so a number of publishers had to scramble to create new materials for the course. It was also invented to allow students to get content from physics and chemistry before the high school TAKS science exam, rather than relying in 11th grade on what they remember from 6th grade. It also covered concepts kids might need before biology in the 10th grade.