1961 Aldous Huxley and Tim Leary give lectures on LSD and behaviour change at an international psychology conference in Copenhagen. *** Prof. Richard Alpert and graduate student Ralph Metzner join Leary’s group, which develops the concept of `set and setting` as trip determinants. *** Concord Prison Project commences, in which psilocybin is taken together by Harvard researchers and prisoners, reversing rates of recidivism for the latter group. *** Publication of Exploring Inner Space is the first personal account of LSD therapy in the U.S. by nutritionist Adelle Davis.