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Twentieth century science completely revolutionized human understanding of the world, rewriting the story of the universe with exciting discoveries and theories—the big bang, the relativity of space and time, the accelerating expansion of the universe, along with increasingly refined ideas of evolution and the origin of life.

Fans of xkcd ask Munroe a lot of strange questions: What if you tried to hit a baseball pitched at ninety percent the speed of light? How fast can you hit a speed bump while driving and live? If there was a robot apocalypse, how long would humanity last? What if everyone only had one soulmate? What would happen if the moon went away? In pursuit of answers, Munroe runs computer simulations, pores over stacks of declassified military research memos, solves differential equations, and consults with nuclear reactor operators.

From ventilators to brain implants, medicine has been blurring what it means to die. In a lucid description of modern neuroscientific thinking, Zeleznikow-Johnston explains that death is not the loss of breath, but of personal identity – that the core of our identities is our minds, and that our minds are encoded in the structure of our brains. On this basis, he explores how recent discoveries now offer us all the chance of preserving our minds for future revival. Whether they discovered cures or fought for justice, we are grateful to those of our ancestors who helped craft a kinder world.

Thanks to recent advances in AI, humans have entered a world where we are no longer the sole custodians of knowledge. A new wave of disarmingly human-like chatbots, such as ChatGPT, Claude and Bard, appear to be able to talk and reason like us - and are beginning to transform everything we do. It is vital we understand how they work. Can AI ‘think’, 'know' and ‘understand’? What are its values? Whose biases is it perpetuating? Can it lie and if so, could we tell? Does their arrival threaten our very existence?

Engaging, thought-provoking, and groundbreaking, The Immortal Mind shows here that some aspect of who we are is spiritual and immortal, transcending the physical body. Using science, he proves the existence of the human soul.