Howard Lutnick, the chief executive of Cantor Fitzgerald, one of the world’s largest financial-services firms, still cries when he talks about it. Not long after the planes struck the twin towers, killing 658 of his co-workers and friends, including his brother, one of the first things on Lutnick’s mind was passwords. This may seem callous, but it was not.

via The Secret Life of Passwords – NYTimes.com.