A 30-year-old postdoctoral researcher at the University of California's plant biology department was killed in Ethiopia when the vehicle she was riding in was struck by rocks thrown by protesters. The university said in a statement Wednesday that Sharon Gray was in the East African country for a meeting about her research when she was killed Tuesday while traveling in a car in the outskirts of the capital, Addis Ababa. Her field of study was looking at the effects of elevated atmospheric carbon dioxide on certain tomato roots. There has been unrest in Ethiopa for months and is increasingly becoming...