I agree AnadY, the most practical gadget here is the call for assistance. It serves an important need. The other three gadgets have value and they're all impressive as homemade products, but the call of assistance was created to improve someone's life. That said, the crock pot was also developed to improve someone's life. The bike proves out the ability to manage fluids, and the camera is nothing but amazing in the creation of its own parts.
Okay, now this is a difficult task. All these creations are freakish. That said, if I absolutely had to make a decision, this would be my least start from the least freakish to the absolute gadget freak in this group; A gadget's call for assistance, the analog camera from 3D parts, the programmable crock pot and Mr shock with his bike. But that's just me.
Festo's BionicKangaroo combines pneumatic and electrical drive technology, plus very precise controls and condition monitoring. Like a real kangaroo, the BionicKangaroo robot harvests the kinetic energy of each takeoff and immediately uses it to power the next jump.
Design News and Digi-Key presents: Creating & Testing Your First RTOS Application Using MQX, a crash course that will look at defining a project, selecting a target processor, blocking code, defining tasks, completing code, and debugging.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.