Optics + the scientific method
11th-century Arab polymath born in Basra; worked in Cairo.
Bragged he could regulate the Nile's flooding; when the caliph called his bluff, he faked insanity for a decade to avoid execution. Used the house arrest to write the Book of Optics — the first work to insist science needs controlled experiments AND mathematical proof. Modern science quietly starts with him.
Ibn al-Haytham (Alhazen) is one of the historical characters you can play as in Rubicon, a trivia game where you answer in your own words and an AI judge reads what you meant. Ibn al-Haytham (Alhazen) is filed under Natural Sciences, and is strongest at Natural Sciences.