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How can we get others to freely do what we want them to do? For over sixty years, researchers have been interested in this question, so much so that we now have a set of social influence techniques – not to say manipulation – whose effectiveness has been scientifically established. These techniques can, of course, be used for the worst. But they can also be used for the best, when it comes to, for example, preventing people from being affected in their psychological or physical integrity. This shows the ethical stakes. Fleurance Astronomy Festival 2017 Science Marathon http://www.festival-astronomie.fr