Farmers know a lot about soil. They study it, test it, nurture it, plant in it, drain and tile it, protect it.
Yet there is more to learn about this importance substance that we so often take for granted. We might know a lot about the soil under our feet today, yet chances are that most folks don't know the evolution of soils, the various soil types in the U.S. and around the world, and the importance of soils in everyday lives.
Thanks to a traveling Smithsonian exhibit…