Dr. Robert Lefkowitz of Duke University hugs his adminstrative assistant of 35 years, Donna Addison, in Lefkowitz' office at Duke on Wednesday, Oct. 10, 2012, the day Lefkowitz heard he had won the 2012 Nobel Prize in chemistry. Lefkowitz and Brian Kobilka of Stanford University School of Medicine won the Nobel Prize in chemistry Wednesday for studies of protein receptors that let body cells sense and respond to outside signals like danger or the flavor of food. Such studies are key for developing better drugs. (AP Photo//Ted Richardson)

Photos of the day - October 10, 2012