I have not proved that the universe is, in fact, a digital computer and that it's capable of performing universal computation, but it's plausible that it is.

There are considerable advantages to using many degrees of freedom to store information, stability and controllability being perhaps the most important.

Quantum mechanics is weird. I don't understand it. Just live with it. You don't have to understand the nature of things in order to build cool devices.

At some point, Moore's law will break down.

Some folks think life and technology and mind can keep expanding forever. Others say it can't. We are still not clear on that.

[With quantum computers] you can calculate how many bits are in the universe, how much energy it takes to flip them, how much energy exists, and use that to rule out lots of things about the universe's history. Anything that takes more bit flips couldn't have happened.

If you wanted to build the most powerful computer you could, you can't do better than including everything in the universe that's potentially available.