Gianni A. Sarcone and Marie-Jo Waeber are experts in brain training and are particularly involved in cognitive sciences (teaching methodology, creativity and communication). They have written numerous books on topics ranging from optical illusions to visual and critical thinking. The authors live and work in Genoa, Italy. Gianni A. Sarcone and Marie-Jo Waeber are experts in brain training and are particularly involved in cognitive sciences (teaching methodology, creativity and communication). They have written numerous books on topics ranging from optical illusions to visual and critical thinking. The authors live and work in Genoa, Italy.