Random bits

“Brazilian government officials disputed the report [that cyberattacks had taken down power grids in Brazil] over the weekend, and [the] director of [Brazil's] Homeland Security Information and Communication Directorate…found no evidence of hacker attacks, adding that Brazil’s electric control systems are not directly connected to the internet.”

A purported proof of the four-color theorem…without using computers

http://www.wired.com/threatlevel/2009/11/brazil_blackout/

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