Enlarge ImageScience of sleep. The scientists used fluorescent proteins--green and red in these images--to determine whether E. coli bacteria were active.Credit: Gefen et al., PNAS 105 (22 April 2008) Most antibiotics kill only microbes that are growing and multiplying, leaving untouched a select few that are hibernating. A new study suggests that a dose of the right nutrients can awaken these bacteria for just long enough to kill them with antibiotics. If the strategy works in humans, it might provide a more effective way to treat persistent diseases such as tuberculosis and urinary-tract infections. During infections, bacteria may slow...