A group of hackers have built a robot that can crack a safe. A team from SparkFun Electronics in Colorado took their robot to the underground hacking convention, Def Con in Las Vegas. They bought a SentrySafe safe the day before the demonstration and opened it onstage Friday. The robot took about 30 minutes to crack the safe, discovering the combination was 51.36.93. The audience clapped and cheered when the safe was opened.

Last Christmas, Nathan Seidle's wife gave him a second-hand safe she'd found on Craigslist. It was, at first glance, a strange gift. The couple already owned the same model, a $120 SentrySafe combination fire safe they'd bought from Home Depot. But this one, his wife explained, had a particular feature: The original owner had locked it and forgotten the combination. But as the founder of the Niwot, Colorado-based company SparkFun, a DIY and open-source hardware supplier, he's a pretty experienced builder of homemade gadgets, tools, and robots.