Born on This Day: August 18

English mathematician whose Taylor series became foundational to calculus and numerical analysis.

Italian composer and teacher whose operas and pupils influenced European classical music.

American explorer whose leadership of the Lewis and Clark Expedition expanded geographic and scientific knowledge of western North America.

American actor whose dramatic performances influenced postwar film and television.

American first lady and advocate whose work transformed public discussion of mental health and caregiving.

Polish-French filmmaker whose work influenced modern cinema, while his criminal case remains central to his controversial legacy.

Puerto Rican baseball player whose excellence and humanitarian service transformed Latino representation in professional sports.

American actor and director who founded the Sundance Institute and expanded independent filmmaking.