The Calculator and the Wager

Blaise Pascal was born in Clermont-Ferrand, France, on June 19, 1623. His father, a mathematician, educated his children at home. His mother died when he was three. At 12, Pascal discovered Euclid's propositions on his own. At 16, he wrote a treatise on conic sections Descartes refused to believe a teenager authored. At 19, he invented the Pascaline, a mechanical calculator -- one of the first mechanical computers.

His early work was rigorous. He corresponded with Fermat on probability, laying groundwork for probability theory. He proved air has weight and pressure decreases with altitude. His fluid experiments led to Pascal's law, underlying hydraulic systems from car brakes to industrial presses.

the pascaline, pascal's mechanical calculator, c. 1642, conservatoire national des arts et metiers, paris. source: wikimedia commons

On November 23, 1654, Pascal had a religious experience so intense he sewed a written account into his coat. He turned from mathematics toward theology, beginning the Pensees -- thoughts on faith, doubt, and human nature. In it, he advanced Pascal's Wager: if God exists and you believe, infinite reward; if not, you lose nothing. If God exists and you do not believe, you lose everything. The argument treats faith as an engineering problem.

Pascal was chronically ill. In 1658, he distracted himself from a toothache by solving cycloid problems -- solutions so elegant few could match them. He died August 19, 1662, at 39. What he left refused categories. He designed machines and wrestled with the infinite. His legacy lives in every calculator, every probability table, every hydraulic press, and every decision made under uncertainty.