In 1978, a college student called the engineer William LeMessurier with a question about his own building. Citicorp Center had opened in Manhattan the year before, a fifty-nine story tower balanced on stilts, and the student wanted to know how it would handle winds striking its corners. LeMessurier ran the numbers again to answer him. What he found stopped him cold: under the wrong storm, the joints holding his tower together could fail. Nobody was demanding an inspection. The building looked...