Those looking to tinker with humanoid robots aren't exactly lacking for options these days, but Cognitive Spring is taking a slightly different approach than most with its Arduino-based cSpring bipedal robot -- one of the semifinalists in the Insert Coin competition here at Expand. Rather than offering a readymade robot like Nao that largely makes software the focus of user customization, cSpring is designed to be highly customizable (and open source) on both the hardware and software fronts. Indeed, the company is hoping to encourage such development by rewardi