JACKSON, Miss. (AP) — The snow and ice that crippled some states across the South has melted, but it has exposed the fragility of aging waterworks that experts have been warning about for years. Cities across Texas, Tennessee, Louisiana and Mississippi are still grappling with outages that crippled health care facilities and forced families to wait in line for potable water. Mississippi’s capital of Jackson is struggling to repair its water grid. Residents of Memphis, Tennessee, have been told for nearly a week to boil water if they plan to use it for drinking, cooking and brushing their teeth. More than 40,000 Louisianans still had water outages.