CNN – Scientists racing to develop something that will stop the largest Ebola epidemic in history are trying a variety of experimental drugs on patients. Without a cure, the disease has killed at least 3,431 people and infected 7,470 at last count. The first American known to have come down with the disease on U.S. soil, Thomas Duncan, may be receiving a drug called bricindofovir, according to his nephew Joe Weeks. The biopharmaceutical company Chimerix got approval from the FDA for emergency use on Duncan on Friday. Duncan is currently in critical condition in Dallas Continue