Before Freud, nobody discussed unconscious motives, Oedipal complexes, the id and the ego, or Freudian slips. Freud was a complicated, often irascible man, who in 19th-century Vienna developed his still-controversial ideas and the new discipline of psychoanalysis.
For thirty years, the whole last half of his life, Leonardo da Vinci was obsessed with unlocking the secrets of nature. His notebooks are the mind-boggling evidence of a fifteenth-century scientist standing at the edge of the modern world, basing his ideas on observation and experimentation. Scru...