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The episode takes us to discover what is hidden in the folds of the earth. The BBC documentary “Depths of the Earth”, through spectacular images, describes how geology, geographical position and consequently climatic factors influence the development of man and somehow determine his history . Everyone has heard of the placebo effect, but what is the nocebo effect? ​​This term indicates the tendency to negative autosuggestion with respect to, for example, a drug or a therapy. It is the exact opposite of the placebo effect. Francesca Marcelli, has collected the opinions of doctors and researchers on mass psychogenic diseases and on how to recognize the nocebo effect . The “How to do it” column, edited by Rossella Li Vigni, takes us to Puglia, in the Apricena quarries, where a group of paleontologists have made important discoveries on prehistoric animals and men.