"To be honest," he admitted, "I've no doubt that you invented it independently, but they've been using such a device for half a century in the Cetis cluster. They've had no trouble." Hoddan winced. "Did you tell the Minister that?" "Hardly," said the ambassador. "It would have done you no good. You're in open revolt and have performed overt acts of violence against the police. But also it was impolite enough for me to suggest that the local government was stupid. It would have been most undiplomatic to prove it." Hoddan did not feel very proud, just then. "I'm thinking that the cops--quite unofficially--might try to kidnap me from the Embassy. They'll deny that they tried, especially if they manage it. But I think they'll try." "Very likely," said the ambassador. "We'll take precautions." "I'd like to make something--not lethal--just in case," said Hoddan. "If you can trust me not to make deathrays, I'd like to make a generator of odd-shaped microwaves. They're described in textbooks. They ionize the air where they strike. That's all. They make air a high-resistance conductor. Nothing more than that." The ambassador said: "There was an old-fashioned way to make ozone...." When Hoddan nodded, a little surprised, the ambassador said: "By all means go ahead. You should be able to get parts from your room vision-receiver. I'll have some tools given you." Then he added: "Diplomacy has to understand the things that control events. Once it was social position. For a time it was weapons. Then it was commerce. Now it's technology. But I wonder how you'll use the ionization of air to protect yourself from kidnapers! Don't tell me! I'd rather try to guess." He waved his hand in cordial dismissal and an Embassy servant showed Hoddan to his quarters. Ten minutes later another staff man brought him tools such as would be needed for work on a vision set. He was left alone. * * * * * He delicately disassembled the set in his room and began to put some of the parts together in a novel but wholly rational fashion. The science of electronics, like the science of mathematics, had progressed away beyond the point where all of it had practical applications. One could spend a lifetime learning things that research had discovered in the past, and industry had never found a use for. On Zan, industriously reading pirated books, Hoddan hadn't known where utility stopped. He'd kept on learning long after a practical man would have stopped studying to get a paying job.