Have questions about the science underlying the ongoing Ebola crisis? The virus has so far infected more than 8,000 people, making it the largest outbreak of the virus in history. Despite the incredible efforts of local and global public health teams, Tom Frieden, the director of the Centers for Disease Control and Prevention, called the situation "unprecedented" while on a visit to the affected region. He also predicted that it would only get worse before officials could get a handle on the crisis.
