Earlier this year, the Ebola virus popped up for the first time ever in West Africa. How it got there, some 2,000 miles from previous Ebola hotspots in remote parts of Central Africa, remains a mystery. Experts are particularly concerned about the current outbreak, which has sickened more than 250 and killed at least 140, because the pathogen has made its way into Conakry, the densely populated capital city of Guinea.  Read more