 You basically create a big heat exchanger or radiator in the ground that you can pump water into and extract heat by pumping it back up to the surface. And that's all done in a closed loop. So there's no release of chemicals or dirty water. It just circulates through that closed loop over and over, producing clean electricity. Is there a concern about earthquakes? Because I know with hydraulic fracturing, there was always a concern that they could cause earthquakes. Could this cause earthquakes?