with the republic presidential nominee mitt romney. president obama also revoking a chinese company's purchase of four wind farm projects near the u.s. naval physicians restricted airspace in oregon. and on this day in 1928, a chance discovery led to one of the most important medical advances of the 20th century. the scottish scientist alexander fleming had been on vacation when penicillin mold went airborne and contaminated his petrie dishes. he noticed the mold appeared to have killed the bacteria. he published the findings. few paid attention at all until years later doctors at oxford university, not other one. used research to develop the drug we now known aspen sill alan. the world's first viable antibiotic. doctors credit it with saving untold millions of lives. antibiotics are so common that