A Man Who Thinks Otherwise

In an academic career spanning seven decades, the lowest point for Philip Morrison came when students at Cornell University picked up rocks and hurled them at him.

It was late October 1962, when John F. Kennedy and Nikita S. Khrushchev were pushing each other to the brink of war in a standoff over Soviet nuclear missiles in Cuba. Mr. Morrison, a professor of physics, stood on the steps of Cornell's student union, using his cane to help steady legs weakened by childhood polio. Along