Now, being a science fiction writer, when I see a natural principle, I wonder if it could fail.

A little-known truth: Every aspect of the world is fundamentally unpredictable. Computer scientists have long since proved this.

The churning of a human mind is unpredictable, as is the anatomy of the human heart.

Our bodies are the time machine.

If you think of your life as a kind of computation, it's quite abundantly clear that there's not going to be a final answer and there won't be anything particularly wonderful about having the computation halt!

What is the shape of space? Is it flat, or is it bent? Is it nicely laid out, or is it warped and shrunken? Is it finite, or is it infinite? Which of the following does space resemble more: (a) a sheet of paper, (b) an endless desert, (c) a soap bubble, (d) a doughnut, (e) an Escher drawing, (f) an ice cream cone, (g) the branches of a tree, or (h) a human body?

Electronic distribution is more of a fall-back strategy for putting out a book that isn't deemed profitable enough to print. You hardly make any money publishing an electronic book.