Isaac Newton invented calculus, discovered the laws of gravity and motion, and built the foundations of modern physics. But he spent far more of his life on pursuits he kept hidden — decades of secret alchemical experiments, obsessive biblical chronology calculations, and a surprisingly ruthless career hunting counterfeiters as Warden of the Royal Mint.

This episode reveals the Newton his public image conceals: the alchemist who wrote more about transmuting metals than about physics, the theologian who secretly rejected the Trinity, and the government official who personally sent men to the gallows.

• Newton’s hidden alchemical manuscripts and his decades-long search for the philosopher’s stone
• His secret theological writings that would have destroyed his career if discovered
• The bitter feud with Leibniz over the invention of calculus
• Newton’s ruthless career at the Royal Mint hunting and prosecuting counterfeiters