Willis Carrier designed the first modern air-conditioning system in 1902 to solve a production problem at the Sackett & Wilhelms printing plant in Brooklyn, New York. Paper used in the company’s multi-color printing presses was plagued by changes in humidity, causing the misalignment of colors and wavy edges that jammed feeding mechanisms, and slowing the drying of ink. Carrier’s solution, which focused on controlling humidity, would launch an industry and fundamentally improve the way we live, work, and play.