June 4, 2010 9:52 pm Why Caffeine May Not Be Giving You a Boost A new study suggests regular coffee drinkers are immune to the pick-me-up effect of caffeine. Wake Up to Something Good 1:47 Heavy rainfall affects parts of DFW, Kaufman County 2:43 Governor declares state of emergency after Oklahoma tornadoes 2:09 Aftermath of heavy flooding in Kaufman County 1:41 Multiple killed during Oklahoma tornadoes 6:20 5 Talk Street: Dallas Cinco de Mayo