Researchers Who Built Essential Scientific Tools

Many of science's biggest leaps came from someone building a better way to look, measure or copy, and then everyone else using it. This list follows the people behind instruments and methods that whole fields now rely on, from the first powerful microscopes to gene editing, in order of when the tool appeared. Each entry explains what the tool does, who helped build it, often an overlooked partner or technician, and the research it made possible.