| About the Author | MAX TEGMARK is an MIT professor who has authored more than 200 technical papers on topics from cosmology to artificial intelligence. As president of the Future of Life Institute, he worked with Elon Musk to launch the first-ever grants program for AI safety research. He has been featured in dozens of science documentaries. His passion for ideas, adventure, and entrepreneurship is infectious. Excerpt. © Reprinted by permission. All rights reserved. THE THREE STAGES OF LIFE The question of how to define life is notoriously controversial. Competing definitions abound, some of which include highly specific requirements such as being composed of cells, which might disqualify both future intelligent machines and extraterrestrial civilizations. Since we don’t want to limit our thinking about the future of life to the species we’ve encountered so far, let’s instead define life very broadly, simply as a process that can retain its complexity and replicate. What’s replicated isn’t matter (made of atoms) but information (made of bits) specifying how the atoms are arranged. When a bacterium makes a copy of its DNA, no new atoms are created, but a new set of atoms are arranged in the same pattern as the original, thereby copying the information. In other words, we can think of life as a self-replicating information processing system whose information (software) determines both its behavior and the blueprints for its hardware. Like our universe itself, life gradually grew more complex and interesting, and as I’ll now explain, I find it helpful to classify life forms into three levels of sophistication: Life 1.0, 2.0 and 3.0. It’s still an open question how, when and where life first appeared in our universe, but there is strong evidence that, here on Earth, life first appeared about 4 billion years ago. Before long, our planet was teeming with a diverse panoply of life forms. |
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