Time has always been a fascinating and mysterious subject. Part of this “mystery” is likely due to our tendency to consider time as a single entity, failing to recognize its threefold nature: physical, biological, and psychological. Physical time helps us paint a picture of natural phenomena as objective as possible; biological time dictates the rhythms of our organism; psychological time, on the other hand, accompanies the flow of our thoughts. This book discusses, in an accessible yet never banal way, the relationship between the three faces of time in light of the advances in modern complex systems science, inevitably touching on the powerful arrival of artificial intelligence. The resulting picture is of a time that is perhaps less mysterious, but certainly no less relevant to understanding the world around and within us.