Dean Buonomano explores the relationship between the brain and time, investigating what time is, why it seems to speed up or slow down, and whether our perception of time passing is an illusion. Buonomano presents his theory on how the brain measures time and sheds light on concepts such as consciousness, space-time, and relativity from the perspective of a neuroscientist. He draws on physics, evolutionary biology, and philosophy, suggesting that the ultimate purpose of the brain may be to predict the future, indicating that your brain is a time machine.