Do we have free will? Can we trust our memories? How well do you know yourself? Felix Friedberg answers these questions in Caveat Homo Sapiens, arguing that humanity, while limited by the non-existence of free will, gains salvation in the ability to respond. Subjectivity, memory, psychotropic drugs, and the existence of the subconscious mind are explored, especially concerning their impact on self-knowledge and perception. Accessible to the general educated reader, the book will also be of interest to psychiatrists, sociologists and philosophers.