For this issue, I interviewed science-fiction writer Ray Bradbury. At 85, he's lost none of his enthusiasm and optimism for the future of science and technology as well as for humankind. For Bradbury, space is not a business opportunity, but destiny. He feels we have to return to the moon and beyond. Without that continual push for exploration, humankind will cease to exist. Our thirst for immortality is what drives our desire to explore space. You can read more of Bradbury's views in "Last Byte," on page 30. But for an immediate take on space issues, turn to our cover...