National Public Radio: A place called Harvard Forest sounds like it should inspire deep thoughts about nature. And in fact, it does. This forest in north central Massachusetts is under a microscope. Throughout the forest, you see signs of research under way. Hundreds of trees are labeled and wear shiny metal belts to measure their growth. Buckets collect falling leaves; holes in the ground yield data on the soil. Slowly, the forest is giving up its secrets. One of the most startling …