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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 unive...

Latest updates on this topic from reliable sources.

>> reporter: 32-year-old jesse matthew, a uva hospital operating room assistant, has been officially charged with graham's abduction. >> the extradition process is currently underway. >> reporter: police first considered matthew a person of interest after seeing him with hannah on several surveillance videos in the early morning hours before she disappeared. after searches of matthew's home and car, investigators honed in on specific clothing in matthew's home. but officials declined to say if that discovery led to the abduction charge. >> we need to be very sensitive about the information tha...