This week: A vaccine for Ebola, Facebook enters the drone game, the President reveals his clean energy plan, researchers help paralyzed patients move their limbs without surgery, and America destroys its first friendly hitchhiking robot. Ebola Vaccine Successfully Tested A vaccine for Ebola produced in just one year instead of the usual decade provides 100-per-cent protection against the disease. Preparations are already under way to make it available to healthcare workers an