What's The 'Z Division'? A Secret Team Of Scientists Searches For Answers On COVID-19's Origins.

WASHINGTON – Tucked away in a secretive office, a little-known team of government scientists began looking into al-Qaeda and the possibility of a biological weapons attack after terrorists exposed a "gaping hole" in national security on Sept. 11, 2001.

Known simply as the "Z Division," the team was established in the U.S. Department of Energy to help intelligence agencies understand the significance of Soviet nuclear weapons tests. But the 9/11 terrorist attacks would change its mission. 

Two decades later, the Z Division finds itself in the middle of a storm as it tries to answer the question that scientists, doctors and ordinary Americans are asking about the roots of the COVID-19 pandemic: How did it happen?