Why are some animals able to regenerate the form and function of almost any body part? What are the similarities and differences in the genetic circuits for regeneration in these animals? To what extent do humans share these genetic circuits? How can we manipulate these circuits in humans to trigger regeneration of lost or damaged tissues and organs? These are some of the intriguing questions that will be addressed in a three-day symposium sponsored by the MDI Biological Laboratory entitled “Learning from Nature: Comparative Biology of Tissue Regeneration and Aging,” Aug. 4 through 6, 2017. The symposium, which is open to the public, will be held on the institution's campus in Bar Harbor, Maine.