WHEN THE SPACE SHUTTLE CHALLENGER LIFTED off on its 10th mission, on a Tuesday morning in January 1986, Holly Ridings watched the launch on TV, along with her sixth-grade classmates, in an Amarillo, Texas middle-school cafeteria. “We watched Challenger go up into the sky,” she says, “but we didn’t understand exactly what happened, that the Y-shaped smoke trail wasn’t right. But you could tell by the tone of the teachers’ conversations and their sad faces that something went wrong.” The accident changed her life. “My reaction, as I figured it out contextually over the next few days, was, Hey, I want to help solve that problem! ”
At 12 years old, Ridings could already hear an inner engineer voice telling her that she was, in her words, “a fix-it person”…