The Age of Spiritual Machines by Ray Kurzweil explores a future where machines rival and eventually surpass human intelligence. Kurzweil predicts rapid technological progress leading to conscious, self-aware computers by the 21st century. He discusses the merging of biology and technology, forecasting a world where humans enhance their minds through AI. The book blends futurism with philosophy, questioning what it means to be human. It’s a provocative look at how exponential growth in computing might reshape society and consciousness itself.