-- A healthy American chestnut tree discovered on a New Hampshire farm may serve as the "mother tree" to bring back a species nearly wiped out by Asian blight.The tree was found on a 125-acre parcel owned by Bill and Nancy Yates. Bill Yates remembers 60 years ago when American chestnuts lined the road near his home before the tree was all but wiped out on the Eastern seaboard. American Chestnut Foundation officials hope to use the tree as a way to bring the tree back to New Hampshire. Leila Pinchot, the foundation's New England science coordinator, pollinated the 40-foot...