F. (François) Arago

Born in Estagel in 1786, François Arago became one of the most admired scientific minds in 19th-century France. Trained at the École Polytechnique, he first won attention for dangerous geodetic work helping extend the measurement of the Paris meridian, a project tied to the early history of the metric system. He went on to build a major reputation as an astronomer, physicist, and mathematician.

Arago is especially remembered for research on light, polarization, and magnetism, as well as for his gift as a lecturer and explainer. He served at the Paris Observatory, joined the French Academy of Sciences while still very young, and became known for making difficult ideas vivid to broad audiences. His scientific writing and public talks helped connect advanced research with everyday readers and listeners.

He was also active in politics during a turbulent period in French history, serving in government in 1848 while remaining closely tied to science. That combination of discovery, public service, and clear communication made him an unusual figure: not only a working scientist, but also one of the era's great popularizers of science. He died in Paris in 1853.