Scientists are engineering "good bugs" to defeat deadly bacteria such as these clusters of the notorious MRSA (Methicillin-resistant Staphylococcus aureus) strain, here magnified 9,560 times. MRSA resists treatment by almost all stardard anti-biotics. (anice Haney Carr/CDD/MCT) ORG XMIT: MIN2013092416181868 (The Minnesota Star Tribune)