Kathleen Booth, a British computing pioneer, has died at the age of 100. She is credited with inventing assembly language and made significant contributions to the development of early computers, including the Automatic Relay Calculator (ARC) and the Simple Electronic Computer (SEC). Booth's work laid the foundation for modern computer programming and she is considered one of the most important figures in the history of computing. She passed away on September 29, 2022, leaving behind a legacy in the field of computer science.