Ray Bradbury is, for many reasons, the most influential writer in my life. Throughout our long friendship, Ray supplied not only his terrific stories but a grand model of what a writer could be, should be, and yet rarely is: brilliant and charming and accessible, willing to tolerate and to teach, happy to inspire but also to be inspired.

Why do we capital-N Nerds love Mars so much? Because it's beautiful, it's tough, it's buried in our mythic, childhood memories. It's covered with human triumphs but also with sad stories of failure.

It's kind of a misnomer about science fiction that science fiction is about anything other than people. It's about people doing stuff, sometimes doing extraordinary stuff.