90% of the mass in your body comes from empty space.

Religious leaders need to be held accountable for their ideas.

The amazing thing is that every atom in your body came from a star that exploded.

Metaphysical speculation is independent of the physical validity of the Big Bang itself and is irrelevant to our understanding of it.

[The writers of the holy books] did not even know the earth revolves around the sun. Why are we listening?

Keeping religion immune from criticism is both unwarranted and dangerous.

We now know that we are more insignificant than we ever imagined. If you get rid of everything we see, the universe is essentially the same. We constitute a 1 percent bit of pollution in a universe . . . we are completely irrelevant.