Hunting Down Ebola's Origins: Too Little Too Late?

The deadly Ebola virus that is sweeping across west Africa, infecting and killing thousands of people, is thought have had originated in small and unassuming animals. Researchers have stumbled upon a number of carriers of the disease in the animal kingdom, where it is just as much an epidemic as it is in urban Africa. Some hope that finding the source of the disease will help them understand how it suddenly became so prevalent among humans.