This book investigates the potential trajectory of human evolution and technological advancement, specifically questioning how humanity might adapt to or be replaced by enhanced biological and mechanical entities. Jeanne Bendick draws upon contemporary scientific speculation and sociological trends to examine the intersection of human potential and machine intelligence. The text functions as an inquiry into the ethical and practical implications of creating beings that surpass current human limitations.

Readers frequently note the accessible, speculative nature of the prose, which serves as a primer for mid-century futurist thought. Experts highlight this as a representative example of popular science writing from its era, focusing on conceptual exploration rather than rigorous empirical data.