by Jane Koerner Pennsylvania Mountain may be too modest in contour and elevation to compete with the fourteeners of international renown, but the biologists don’t complain. While hundreds of hikers elbow their way up the highest peaks of the Mosquito Range, the scientists inspect their decades-old tundra plots relatively undisturbed. On the ridge below their tagged plants, 1,800 year-old bristlecones contort the well-traveled pathway. In the valley to the northeast, beaver ponds along Pennsylvania Creek testify to a work ethic that would put our Puritan forebears to shame, benefitting wildlife and humans alike. But like the rest of the range, ...