This Robotic Mining Car Never Stops Hauling

The demand for minerals is skyrocketing—not just for rare earths like neodymium, europium, and cerium used in the iPhone 5, but phosphorous and coal too. As that demand rises, miners must dig deeper into the ground. But the lower they go, the more dangerous the job becomes—71 miners died in 2010 in the US alone. This… »11/06/12 11:30am11/06/12 11:30am