Yvonne Y. Clark, known as YY throughout her career, has also been nicknamed “The First Lady of Engineering,” because of her groundbreaking achievements as a Black female mechanical engineer. Season 3 of Lost Women of Science traces her trajectory, from her unconventional childhood interest in fixing appliances to civil rights breakthroughs in the segregated South; from her trailblazing role at historically Black colleges and universities to her work at NASA. What can YY teach us about what it means to be the first in a scientific field, especially as a Black woman in America?