Concerned way back in the early 1980s about the Cold War arms race between the two super-powers, Tennison, then a nurse, flew to Moscow to meet "the enemy." With friends, she talked with ordinary people in parks, in the metro, and on the street, and began an adventure that has lasted three decades, with programs for supporting large scale exchanges, for creating a sober society, for training entrepreneurs, to give only three examples. In her new book, The Power of Impossible Ideas, the author tells about repeatedly asking not "is it possible?" but rather "is it necessary?" Whatever their reasons, citizen diplomacy gave the Soviets something to move into. Tennison tells how it developed.