you will be unprotected against Tharn. Keep the device. It will, as I promised, ensure your health, fame and fortune, far more effectively than a—a horoscope.” “No, thanks. I don’t know how you managed that trick—sub-sonics, maybe, but I don’t—” “Wait,” the robot said. “When you pressed that button, you were in the mind of someone who exists very far in the future. It created a temporal rapport. You can bring about that rapport any time you press the button.” “Heaven forfend,” Kelvin said, still sweating a little. “Consider the opportunities. Suppose a troglodyte of the far past had access to your brain? He could achieve anything he wanted.” It had become important, somehow, to find a logical rebuttal to the robot’s arguments. “Like St. Anthony—or was it Luther?—arguing with the devil?” Kelvin thought dizzily. His headache was worse, and he suspected he had drunk more than was good for him. But he merely said: “How could a troglodyte understand what’s in my brain? He couldn’t apply the knowledge without the same conditioning I’ve had.” “Have you ever had sudden and apparently illogical ideas? Compulsions? So that you seem forced to think of certain things, count up to certain numbers, work out particular problems? Well, the man in the future on whom my device is focused doesn’t know he’s en rapport with you, Kelvin. But he’s vulnerable to compulsions. All you have to do is concentrate on a problem and then press the button. Your rapport will be compelled—illogically, from his viewpoint—to solve that problem. And you’ll be reading his brain. You’ll find out how it works. There are limitations, you’ll learn those too. And the device will ensure health, wealth and fame for you.” “It would ensure anything, if it really worked that way. I could do anything. That’s why I’m not buying!” “I said there were limitations. As soon as you’ve successfully achieved health, fame, and fortune, the device will become useless. I’ve taken care of that. But meanwhile you can use it to solve all your problems by tapping the brain of the more intelligent specimen in the future. The important point is to concentrate on your problems before you press the button. Otherwise you may get more than Tharn on your track.” “Tharn? What—” “I think an—an android,” the robot