If math geeks designed ATMs, you wouldn’t have to enter a PIN number after inserting your card, but rather solve a randomly generated math problem in under 30-seconds. For those able to solve each and every problem, this would definitely be the ultimate in ATM security…if you throw in a few world problems too that is.

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Simply put, the Coilgun — aka magnetic / gauss guns — is “a type of projectile accelerator that consists of one or more coils used as electromagnets in the configuration of a synchronous linear electric motor which accelerate a magnetic projectile to high velocity.” Continue reading to see five of the coolest homemade examples.

Amazon is selling the Seagate Barracuda 7200 1.5TB hard drive for just $79.99 shipped, originally priced at $199.99. This drive “features a fast 7200-RPM drive that delivers sustained transfer rates of up to 125MB/s.” Product page.

Delivers the optimum mix of performance and energy efficiency thanks to perpendicular recording technology, a SATA 3Gb/s interface, Native Command Queuing (NCQ), and up to 32MB cache.

[via Amazon]

Ever wished you could win rock, paper, scissors every time you played? Wish no more, as this infographic will tell you how and more. Did you know that the earliest form of the game was found in 18th century Japan, and called Jan-ken-pon? If not, continue reading for more facts and some strategy.

[via Flowingdata]