Lucille Pope's red oak tree has baffled tree experts, water specialists and nursery professionals. The knotted, towering tree, more than 100 years old, has become the root of scrutiny in her East Side neighborhood. The tree has gurgled water from its trunk for the past three months. Pope, 65, has sought answers from several specialists, calling experts from the Texas Forest Service, the Edwards Aquifer Authority and nurseries for an explanation. They've combed her backyard, probing the gnarled tree that leans away from a parked white 1980s Cadillac. After snapping pictures, doing taste tests and conducting preliminary studies, they're still...