The book is about the march toward a potentially posthuman future in which emerging technologies will allow humans to shape their bodies and minds, or possibly destroy life on earth, or even the universe. Garreau describes these as the "GRIN" technologies: genetics, robotics, information, and nanotechnology.
- Garreau's website for the book
- Bostrom, Nick (June 27, 2005). "The Future of Humankind". Scientific American.
- Markey, Sean (August 3, 2005). "The Human-Techno Future: How Weird? How Soon?". National Geographic.
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