Explores the life and achievements of the seventeenth-century English physicist and mathematician, from his early years and education to his scientific breakthroughs in mathematics, physics, and light refraction. Mission Science Science Readers Series Interest Level: 3-6 Reading Level: 6.7 ATOS Book Level: 6 AR Interest Level: MG AR Points: 1 AR Quiz: 131441EN Lexile Measure: 940 Lexile Code: IG (Illustrated Guide) Fountas & Pinnell: X.