One can't predict the weather more than a few days in advance.

I want my books sold on airport bookstalls.

One could say: "The boundary condition of the universe is that it has no boundary." The universe would be completely self-contained and not affected by anything outside itself. It would neither be created nor destroyed. It would just BE.

The universe is governed by science. But science tells us that we can't solve the equations, directly in the abstract.

It is said that there's no such thing as a free lunch. But the universe is the ultimate free lunch.

Not to leave planet Earth would be like castaways on a desert island not trying to escape...Sending humans to other planets ... will shape the future of the human race in ways we don't yet understand, and may determine whether we have any future at all.

I would rather be right than rigorous.