http://gizmodo.com/gadgets/gadgets/puzzle-alarm-clock-presents-mild-challenge-wakes-you-up-157999.php An alarm clock which has a puzzle on top you need to solve in order to stop its alarm.
http://www.youtube.com/watch?v=OoETMCosULQ Drivers go the speed limit which blocks off all traffic. A good, short documentary.
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