The postscript addresses the growing influence of the US on the direction and agenda of UNESCO between its inception and the early 1950s. It does so by placing the other chapters in dialogue with a major 1950 report to the US State Department on the role of science in foreign relations, the so-called Berkner Report. It argues that the conviction that science and its popularization could catalyze world peace and that international collaboration could unite people around shared values was displaced by a US-led foreign policy agenda. UNESCO became a site for the struggle against fascism and communism in the early Cold War. Its sponsored exhibitions suggested that the open-minded critical spirit of the “scientific temper” (Oppenheimer) could only flourish in a democracy. To conclude, the author briefly links the historical cases with present-day challenges to democracy and freedom, in which again the use of science, its nature and its impact in our digital public sphere is under continuous discussion.