??? Read More A Retrospective Look at Chem-Bio TerrorismSteven Bucci | August 2, 2011The Center for a New American Security released an excellent study ??? ???Aum Shinrikyo: Insights Into How Terrorists Develop Biological and Chemical Weapons.??? The result is a superb history of a singular event in modern terrorism history ??? the Sarin nerve gas attack on Tokyo in 1995.