Remember that movie, starring Sean Connery, where the Medicine Man discovers the cure for cancer in the rain forest vegetation? Of course the logging companies want to cut down all the trees and destroy the ecosystem. A fight ensues, and as it turns out the cure is in the ants, not in the plants.
So... why does the maple syrup turn dark as the season progresses? Is it due to chemical changes in the sap -- from the maple tree? Or is it from all the insects that are attracted to the sap, and get filtered out in the syrup making process?
Something to think about.