1931. As Thomas Edison was dying, he left test tubes of what he believed would be his final breath, until it was. His intent was to leave his "last breath," for his prot g , friend, and confidant, Henry Ford. But forty-two tubes were lost after he died. Then, year after year, one of the tubes of Edison's breath would arrive at Ford's Florida winter home where Ford would open it and breathe in the breath of his dead friend. He thought it brought...