During the Cold War, nothing loomed as large in the public mind as the bomb. When the Soviet Empire collapsed, the bomb became a symbol of another era. Naively we felt the danger had passed. In recent years, the threat of nuclear proliferation has grown more urgent, and the political will to eliminate nuclear weapons is greater than ever in our history. We have now entered a second nuclear age. Nuclear weapons have proliferated to nine nations, and that number could continue to grow, as over 40 nations have the technical capacity to construct nuclear weapons. Terrorists are actively seeking nuclear weapons and fissile material, not to use as political leverage, but rather as tools of mass destruction. Equally as great a threat is human error; the possibility of an accident increases every day.