AUBURN, Alabama, July 9 -- Auburn University issued the following news: * * * Power under pressure: Auburn Engineering professor explains how summer heat strains the grid By Joe McAdory When a recent Yahoo News headline warned that "Extreme Heat Is Straining the U.S. Power Grid," it echoed what many across the country have already experienced firsthand: flickering lights, skyrocketing energy bills and the uneasy hum of an air conditioning unit pushing to keep up. What happens to power syste  more