Houston firefighters learn to use a video chat program that will let them consult with an emergency medicine doctor while responding to 911 calls. Courtesy of Houston Fire Department hide caption

itoggle caption Courtesy of Houston Fire Department

Workers walk inside the LyondellBasell oil refinery in Houston in 2013. Lower oil prices are stoking fears of an economic decline in the region. Donna Carson/Reuters/Corbis hide caption

itoggle caption Donna Carson/Reuters/Corbis

The sign tells the story: Houston's Astrodome on Tuesday. Pat Sullivan/AP hide caption

itoggle caption Pat Sullivan/AP