Ars Magna (The Great Art).- Appendix: From De Vita Propria Liber (The Book of My Life).- Two Tales of Galileo.- I. The Discovery of the Laws of Motion.- II. The Medicean Stars.- Appendix: Olaf Römer's Conjecture.- Christiaan Huygens, Pendulum Clocks, and a Curve "Not At All Considered by the Ancients".- Appendix: Part Five of Horlogium Oscillatorium.- Blaise Pascal.- Prince of Mathematicians.- I. Gauss' Debut.- II. The Golden Theorem.- III. Royal Days.- Appendix: Construction Problems Leading to Cubic Equations.