Last year, about this same time, my photo group wet to southern Tennessee to photograph Falls Mill near Belvidere. Built in 1873, it still operates five days per week, year-round, grinding corn and wheat. Originally it was built as a cotton factory, and was used over the years as a cotton gin, and wood-working facility. The water wheel is 108 years old and is the sole power of the grinding wheel. So the massive wheel is turned by the force of water falling. And inside the noise is nearly deafening as gears and belts and wheels turn. No fossil fuels, no nuclear energy, no natural gas, no electricity; just water flowing downstream. Simple. Effective.