North Texas May 1, 2017 5:45 pm Supersaturated O2 May Limit Muscle Damage in Heart Attacks Researchers are now testing a cutting-edge therapy that could limit permanent damage to heart muscles where patients get supersaturated oxygen therapy in addition to angioplasty or stents. Wake Up to Something Good 1:07 Hill County tornado caught on camera 2:25 Superintendents work to improve safety in North Texas schools 3:37 Texas tornadoes caught on video 7:16 Severe storms bring tornadoes, flash flooding, hail and lightning to North Texas 4:27 ‘My house, gone,' Texas resident recounts returning home after reports of a tornado