There are many things to remember when operating a nuclear reactor, but one rule is paramount: Stay awake.

Between 6:09 and 6:15 on the morning of June 29, however, the only operator in the control room of the MIT Nuclear Reactor Laboratory, in the heart of Cambridge, was snoozing. There was never any threat to the public, scientists say, but the incident could bring a fine from the US government and is an embarrassment for a university proud of its technical prowess.

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