In other words, we can think of life as a self-replicating information-processing system whose information (software) determines both its behavior an… - Max Tegmark

"The German mathematician Emmy Noether proved in 1915 that each continuous symmetry of our mathematical structure leads to a so-called conservation law of physics, whereby some quantity is guaranteed to stay constant-and thereby has the sort of permanence that might make self-aware observers take note of it and give it a "baggage" name. All the conserved quantities that we discussed in Chapter 7 correspond to such symmetries: for example, energy corresponds to time-translation symmetry (that our laws of physics stay the same for all time), momentum corresponds to space-translation symmetry (that the laws are the same everywhere), angular momentum corresponds to rotation symmetry (that empty space has no special "up" direction) and electric charge corresponds to a certain symmetry of quantum mechanics. The Hungarian physicist Eugene Wigner went on to show that these symmetries also dictated all the quantum properties that particles can have, including mass and spin. In other words, between the two of them, Noether and Wigner showed that, at least in our own mathematical structure, studying the symmetries reveals what sort of "stuff" can exist in it."

Will life in our Universe fulfill its potential or squander it? This depends to a great extent on what we humans alive today do during our lifetime, and I’m optimistic that we can make the future of life truly awesome if we make the right choices.

Even if building robots were physically impossible, a super-intelligent and super-wealthy AI could easily pay or manipulate myriad humans to unwittingly do its bidding,