"Having the equivalent of 150,000 Hiroshima-sized bombs at the ready does nothing to protect us from terrorists planning to sneak in a bomb through a cargo container."

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The reactors in Japan are stable in the same way that a ticking time bomb is also stable. It wouldn't take much to light the fuse - a 6.6 earthquake, like what happened today in Japan, a pipe break, an over-pressurized containment vessel - anything could set it off, in which case we would have another Chernobyl, three times the magnitude of a Chernobyl accident.

— Michio Kaku