David McCullough draws a crowd to discuss book

David McCullough at First Parish Church in Cambridge.Bill Brett for the Boston Globe/Boston Globe

First Parish Church in Cambridge was filled to capacity for a talk by historian David McCullough about his new book, “The Wright Brothers,” about Wilbur and Orville Wright and the flying machine that changed history. McCullough, 81, won the Pulitzer Prize for his books, “Truman” and “John Adams.”