I lived in Berkeley and worked at the Lawrence Livermore National Laboratory, a nuclear-weapons research lab, where I developed computer war simulations. On Sundays I went with my girlfriend to Quaker meetings, where people sat in each other’s company without the pressure to speak. One Sunday some fellow congregants asked if I wanted to join a protest at Livermore Lab. I told them I had to work that day. No one asked me where.

The first Gulf War started. The military used one of my computer simulations to calculate probabilities of hits and kills. Suddenly the simulations were no longer so abstract. Thousands of people were dying. I wanted to join my girlfriend and others who were protesting the war, but I didn’t feel I could as long as I worked at the lab.