FRAGMENT FROM NATURE deals with the genetics of the sense of place for this and next weekend. Frustrating, illusive, and challenging characterizes the hunt for migratory genes. But the physical gene itself is only the start. How can a string of nucleotides communicate a journey and a destination? And time after time to millions of creatures, and be plastic enough to modify as the climate changes? A challenge perhaps beyond our capacity to seriously consider. At least, for now.