The Invisible Century is an original look at two of the most important revolutions—and revolutionaries—of the modern era. This dual biography of Albert Einstein and Sigmund Freud— and their parallel journeys of discovery that altered forever our understanding of the very nature of reality. Einstein and Freud were the foremost figures in search of the next level of scientific knowledge—evidence we can’t see. Here on the frontier of the invisible, their investigations reached unprecedented realms—relativity and the unconscious—and spawned the creation of two new sciences, cosmology and psychoanalysis. Together they have allowed us for more than a hundred years to explore previously unimaginable universes without and within.