You can now officially stop thinking of the achievement gap as intractable. A remarkable approach to teaching high school science has extinguished the achievement gap in science. The New Jersey Center for Teaching and Learning's Progressive Science InitiativeĀ® (PSIĀ®), a program designed to advance attainment in science, has given schools serving high percentages of low-income students and students of color the ability to outperform schools with less diverse, more affluent students.