A 10-kiloton nuclear bomb (a pipsqueak in weapons terms) is smuggled into Manhattan and explodes at Grand Central. Some 500,000 people are killed, and the U.S. suffers $1 trillion in direct economic damage.

That scenario, cited in a report last year from the John F. Kennedy School of Government at Harvard, could be a glimpse of our future. We urgently need to control nuclear materials to forestall that threat, but in this war on proliferation, we're now slipping backward. President Bush (after ignoring the issue before 9/11) now forcefully says the right things — but still doesn't do enough....


A stick of cobalt, an inch thick and a foot long, is taken from among hundreds of such sticks at a food irradiation plant. It is blown up with just 10 pounds of explosives in a "dirty bomb" at the lower tip of Manhattan, with a one-mile-per-hour breeze blowing. Some 1,000 square kilometers in three states is contaminated, and some areas of New York City become uninhabitable for decades.
Nick Kristof, NY Times