On the slope of a thickly forested Czech mountain, three men in hard hats and mud-spattered fluorescent vests dig for the metal that could power a new industrial revolution.

Nvidia CEO Jensen Huang showed up at a gathering of artificial intelligence researchers in Long Beach, Calif. last week with a couple of big surprises.

Fuel cell cars and trucks are a tiny piece of the U.S. clean vehicle market, due in no small part to the limited number of hydrogen fuel stations in California, one of the few places they’re sold. To help fix that Toyota is building a first-of-its-kind refinery to make large quantities of the zero-emission fuel from a dirty source: cow manure.

Once the purview of science fiction, exoskeletons are slowly working their way into real life. These aids are now being used on manufacturing assembly lines.