Spinning thread was one of humanity's first great technologies

St Clair opens with the surprisingly ancient origins of spun fiber, pointing to archaeological finds of twisted plant fibers dating back tens of thousands of years, evidence that predates many technologies we more readily celebrate as civilization-defining. Turning loose, weak plant or animal fibers into a strong, continuous, usable thread required real technical insight into twist, tension, and length that wasn't obvious to discover.

She argues this deserves recognition as a foundational human technology on par with fire or stone tools, because thread and cordage enabled everything from clothing and shelter to nets, rope, and eventually sails, capabilities that expanded what early humans could survive and accomplish. Yet because this innovation is associated historically with women's domestic labor, it rarely appears in popular narratives of technological progress the way toolmaking does.

St Clair uses this opening example to set the book's broader argument: the history of textiles has been systematically undervalued not because it was unimportant, but because of who traditionally did the work. One of civilization's oldest and most consequential technologies has been hiding in plain sight, undervalued precisely because it was women's work.