The whole [scientific] process resembles biological evolution. A problem is like an ecological niche, and a theory is like a gene or a species which is being tested for viability in that niche.

Where we have good, testable explanations, they then have to be tested, and we drop the ones that fail the tests.

If we can't program it, we can't understand it.

Feeling insignificant because the universe is large has exactly the same logic as feeling inadequate for not being a cow.

It is possible to build a virtual-reality generator whose repertoire includes every possible environment.

Every problem that is interesting is also soluble.

If you can’t program it, you haven’t understood it.