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Alive: The Hidden Intelligence of the Living World
What does it mean to be alive? The slow contortion of a plant towards light, the spear-flight of a hawk towards their quarry – these are purposeful actions. But where does that purpose come from, and what does it tell us about who we are?
In Alive, researcher and natural philosopher Melanie Challenger takes us through the latest discoveries in biology and physics to reveal a radical truth: to be alive is first and foremost a way of being a body. From Greenland sharks that can live for half a millennium, to birds that sense the Earth’s magnetic field through their retinas, and even slime moulds that solve mazes, this book tells a new story of intelligence in the living world.
A scientifically grounded challenge to the idea that life is either a machine run by genes or an essence separable from the body, Alive restores agency, purpose and meaning to organisms in an age of artificial intelligence and biodiversity loss. By recognising that our bodies are both how and why we are alive, this book asks what it would mean to live – and to act – with that knowledge.
In Alive, researcher and natural philosopher Melanie Challenger takes us through the latest discoveries in biology and physics to reveal a radical truth: to be alive is first and foremost a way of being a body. From Greenland sharks that can live for half a millennium, to birds that sense the Earth’s magnetic field through their retinas, and even slime moulds that solve mazes, this book tells a new story of intelligence in the living world.
A scientifically grounded challenge to the idea that life is either a machine run by genes or an essence separable from the body, Alive restores agency, purpose and meaning to organisms in an age of artificial intelligence and biodiversity loss. By recognising that our bodies are both how and why we are alive, this book asks what it would mean to live – and to act – with that knowledge.
352 pages, Paperback
First published July 16, 2026
About the author
Melanie Challenger
8 books79 followersMelanie Challenger is a British writer and philosopher whose work explores what it means to be a living being. Her books investigate embodiment, animality, mortality, agency, and humanity’s relationship with the living world. She is the author of On Extinction, How to Be Animal, How to be Animal: What it means to be human, and Alive: The Hidden Intelligence of the Living World. She is host of the podcast The Psychosphere. She is also an award-winning poet and librettist for opera and oratorios, and a National Geographic Explorer.
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Displaying 1 - 5 of 5 reviews
August 21, 2026
The world would be a different place if everyone took these writings to heart
A moving story of what it is like to be alive. Challenger shows us the world of the living, from elephants to planaria and encourages us to care inclusively. I wept at the end. I highly recommend this book!
A moving story of what it is like to be alive. Challenger shows us the world of the living, from elephants to planaria and encourages us to care inclusively. I wept at the end. I highly recommend this book!
April 13, 2026
This was a book of many depths and I enjoyed the angles it included. It was perhaps my own fault that I thought this book was going to be different when I started reading it! I had in mind it would be more of an astrobiology based, origin of life focus but it held many interesting nuggets of knowledge nonetheless.
I liked the heavy foundation of previous history of the early thinkers. At times, it often read like a very well written journal so it’s a fab read for scientists and those involved in the field. It’s so interesting to explore the minds of those who discovered and brought the world into a new light. It covered a variety of topics and there’s a lot to be learnt from books like these!
Thank you to the author and publisher for this book on NetGalley in return for my honest thoughts and review.
I liked the heavy foundation of previous history of the early thinkers. At times, it often read like a very well written journal so it’s a fab read for scientists and those involved in the field. It’s so interesting to explore the minds of those who discovered and brought the world into a new light. It covered a variety of topics and there’s a lot to be learnt from books like these!
Thank you to the author and publisher for this book on NetGalley in return for my honest thoughts and review.
Review of advance copy received from NetGalley
(Note: I received an advanced reader copy of this book courtesy of NetGalley).
**Alive** is one of those books that sets out with a scope so wide you almost have to admire the ambition before you even get into the detail. There's enough content here for several books. Melanie Challenger's thesis is that the intelligent living being plays a bigger part in evolution than alternatives would have you believe. Explanations such as it's all down to DNA (i.e. The Selfish Gene), creation myths from religion, or even the Gaia theory essentially all pass the buck to something else. Challenger argues that living things adapt, respond, communicate, or solve problems, even if that's just a plant adjusting to light or a bacterial colony coordinating behaviour.
The book covers a huge amount of material, and I found myself forgetting at times what it was meant to be about. Aristotle (who argued that the body is the soul) is the starting point; you get medieval theologians and Enlightenment biologists. Then she jumps forward to modern DNA analysis, evolutionary theory, and the latest research on plant signalling and microbial behaviour. AI, social media and the effects of the pandemic are thrown into the mix. What Challenger seems to be pushing toward is a shift in perspective: intelligence isn’t a rare, high-level trait possessed by a few species, but a basic property of living systems expressed in countless small, local ways.
It's a big idea, and the book's ambition sometimes outpaces its clarity. I suspect I'd need to read it more than once to fully grasp the argument and see how all the pieces fit together.
**Alive** is one of those books that sets out with a scope so wide you almost have to admire the ambition before you even get into the detail. There's enough content here for several books. Melanie Challenger's thesis is that the intelligent living being plays a bigger part in evolution than alternatives would have you believe. Explanations such as it's all down to DNA (i.e. The Selfish Gene), creation myths from religion, or even the Gaia theory essentially all pass the buck to something else. Challenger argues that living things adapt, respond, communicate, or solve problems, even if that's just a plant adjusting to light or a bacterial colony coordinating behaviour.
The book covers a huge amount of material, and I found myself forgetting at times what it was meant to be about. Aristotle (who argued that the body is the soul) is the starting point; you get medieval theologians and Enlightenment biologists. Then she jumps forward to modern DNA analysis, evolutionary theory, and the latest research on plant signalling and microbial behaviour. AI, social media and the effects of the pandemic are thrown into the mix. What Challenger seems to be pushing toward is a shift in perspective: intelligence isn’t a rare, high-level trait possessed by a few species, but a basic property of living systems expressed in countless small, local ways.
It's a big idea, and the book's ambition sometimes outpaces its clarity. I suspect I'd need to read it more than once to fully grasp the argument and see how all the pieces fit together.
Review of advance copy received from NetGalley
Alive: The Hidden Intelligence of the Living World is a fascinating exploration of one of the biggest questions we can ask: what does it actually mean to be alive? Melanie Challenger combines biology, philosophy and the history of science to examine life from multiple perspectives, creating a book that is both thought provoking and intellectually engaging.
I really enjoyed how the book encourages curiosity rather than offering simple answers. It challenged many of my assumptions and prompted me to think differently about the relationship between humans, other living organisms and the natural world. There were several ideas that stayed with me long after I had finished reading.
That said, this is not always an easy book to get through. Some of the philosophical discussions are quite dense and I occasionally found myself rereading sections to fully understand the points being made. While I appreciated the depth, I think a slightly more accessible style would have made it even stronger.
Overall, I found this to be a rewarding read that balances science with philosophy in an interesting and thoughtful way. It won't be for everyone, but if you enjoy books that ask big questions and encourage deeper reflection, it's well worth picking up. A compelling and insightful read that earns four stars.
I really enjoyed how the book encourages curiosity rather than offering simple answers. It challenged many of my assumptions and prompted me to think differently about the relationship between humans, other living organisms and the natural world. There were several ideas that stayed with me long after I had finished reading.
That said, this is not always an easy book to get through. Some of the philosophical discussions are quite dense and I occasionally found myself rereading sections to fully understand the points being made. While I appreciated the depth, I think a slightly more accessible style would have made it even stronger.
Overall, I found this to be a rewarding read that balances science with philosophy in an interesting and thoughtful way. It won't be for everyone, but if you enjoy books that ask big questions and encourage deeper reflection, it's well worth picking up. A compelling and insightful read that earns four stars.
Did Not Finish
September 9, 2026I was looking for something more related to biology and intelligence in living organisms. This is about "intelligence" in the overall concept of life as contrasted to non-life. A good book for some philosophical discussions.
Displaying 1 - 5 of 5 reviews