Harvard psychologist Steven Pinker thinks the world is becoming less violent, but scientists believe we’ve taken a step back in our efforts to avert nuclear catastrophe:

It is five minutes to midnight. Two years ago, it appeared that world leaders might address the truly global threats that we face. In many cases, that trend has not continued or been reversed. For that reason, the Bulletin of the Atomic Scientists is moving the clock hand one minute closer to midnight, back to its time in 2007.

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