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Dr. Asimov, 65, is a severe critic of Star Wars. "I'm against it, not because I'm a science-fiction writer, and therefore have special knowledge, but because I like to think I'm a sane human being." He believes Star Wars is a dangerous waste of money. "They're talking about spending $33 billion on research related to Star Wars. We're going to withdraw money from needed aspects of developing knowledge in order to set up something that probably won't work and even if it does work, won't do us any good."

Part of the problem with Star Wars is that it will take years to develop. "If I were the Soviet Union, I would have spent all this time trying to work up methods to penetrate the shield," said Asimov, who was born in Russia but grew up in New York. "I have a strong suspicion it would be cheaper to penetrate the shield than to set it up. "And if we're in real danger of a nuclear war now, trying to set up something for the middle of the 21st century isn't going to do us any good. In fact, by filling us full of false confidence, we're not going to make a strong enough effort to prevent war now."

"There are science-fiction writers, notably myself and Arthur C. Clarke, who were anti-Vietnam and are anti-Star Wars," said Asimov. Clarke, the author of 2001: A Space Odyssey, was born in England and lives in Sri Lanka. "Clarke was howled down once by someone saying as a non-American citizen he had no right to make comments about Star Wars. That's an extremely stupid remark. "If you have no right to decry the policy of a country unless you are a citizen of that country, why the hell is Reagan always yelling about the Soviet Union? Is he a Soviet citizen?"

Within a century, it will be possible to scan a human mind and reproduce it inside a machine. Regardless of whether our minds are just very sophisticated analog computers, or whether they have a quantum-mechanical element (as Roger Penrose proposes), we will nonetheless be able to duplicate them artificially.

Already, at the close of the second millennium, a transhumanist movement has begun; Christopher Dewdney is the principal Canadian spokesperson for it. This movement holds that uploading our consciousness into machines is desirable, since that will free us from biological aging and death. On the other hand (a decidedly biological metaphor), there is more to being human than just the networks of synapses in our brains; clearly, much of what we are is tied in intimately with our bodies. We may find that uploaded humans are not happy — indeed, are incapable of happiness or any emotion.

Just as laws today are moving toward recognizing a woman's right to control her body and any separate sentience that may be contained within it, so too will the laws of the future recognize the right of humans to upload their consciousness and then dispose of the original biological versions of themselves; such eliminations will not be seen as suicides or murders, but rather as a natural, perfectly legal step, eliminating a no-longer-needed biological container and preserving the uniqueness of the individual.