___ is an infamous herbicide that was used during the Vietnam War to defoliate/kill vegetation, especially along the Ho Chi Minh trail. Use of this chemical caused (and continues to cause) cancer, birth defects, and other diseases.

Peace studies is an interdisciplinary academic field that draws on political science, sociology, history, anthropology, theology, psychology, philosophy, and other fields to:

understand the causes of armed conflict;
develop ways to prevent and resolve war, genocide, terrorism, gross violations of human rights; and
build peaceful and just systems and societies.