Nobody knows where it is Boris Cyrulnik and there are only two hours left until, in theory, it offers a masterclass at CosmoCaixa in Barcelona. The renowned neurologist, neuropsychiatrist, and writer—who is about to turn 88—went for a walk after breakfast without picking up his cell phone. Every minute that passes grows uneasy among the EDAI organization, a leading entity in neurodevelopment and child and adolescent mental health, which has invited the author to participate in the fourth edition of the international congress they organize. Cyrulnik has pioneered the use of the term resilience applied to psychology: he himself had to put that capacity to resist and cope with traumatic situations to the test from a very young age. Born in Bordeaux in 1937, the son of a Jewish family originally from Poland, Cyrulnik lost his parents – both deported to the Auschwitz concentration camp – and had to flee from the Nazis and hide for almost three years, until the Second World War ended and his life ceased.