for what is wrong. 1970 four men itbed city hall because house the army research center, which conducted research for the military during the vietnam war. up next, a curator from the wisconsin historian -- historical society shows us some of the artifacts from the bombing. >> we are in the basement of the wisconsin historical society where we house our museum collection. we are going to look at artifacts related to the sterling hall bombing of 1970. sterling hall is the physics department at the university of wisconsin campus. it house the army mathematics research center in 1970. the mathematics research center was a think tank for the army, created in 1957 to find ways to improve access to the and many -- enemy, in this case the vietnam war enemy, and also to provide more weapons. while the madison campus was in general,for the war in they tended to focus a lot of hate -- not hate but their uncomfortableness and anger at the army mathematics research center. they thought they were creating , not theo destroy enemy being soldiers, but also civilians. they felt that this was not a good w