Dr.Adder

The Materializer by Robert T. Kurosaka
The materializer was finished! Ned Quinn stepped back, rubbed his hands together, and admired the huge mass of dials, glowing lights, and switches. Several decades and many fortunes had been dedicated to that project. But it was finally ready! Ned adjusted his metal helmet on his head and plugged the connectors into the control panel. He turned the switch to ON and slowly said, "Ten-dollar bill." A faint buzzing sound was heard. Then a rectangle of paper appeared in the Receiver. Ned inspected it carefully. Authentic. "Martini," he said, satisfied. A new buzzing followed. In the Receiver, a small reddish puddle formed, which began to drip onto the floor. Ned muttered under his breath. He had a lot to learn. "A quart bottle of Dunkel beer," he said with precision. The buzzing was followed by the appearance of the familiar brown bottle. Ned took a sip and smirked. Ecstatic, he continued his experiments. After a while, Ned maximized the Receiver and prepared for his grandest experiment. Now immensely wealthy, his new appetites were naturally dictated by that little libertine devil that resides in each of us. He turned the Materializer back on, took a deep breath, and said, "A girl." The buzzing grew in intensity, then faded. On the Receiver's platform stood a lovely girl, looking around with a bewildered expression. She was completely naked. Ned hadn’t specified any clothing. She had a nose dotted with freckles, braces, and two magnificent braids. She couldn’t have been more than eight years old. "Hellfire!" exclaimed Ned Quinn. A buzzing was heard. The firefighters found two charred skeletons among the smoking ruins.
Original title: A Lot to Learn - © 1978 Robert T. Kurosaka.

(Part II). Larry Niven's Mistake.

"What’s the point of it?"
"It ends the trip. It sets me right again."
"Will it clear your head?"
"Of course!" Kthistlmup let him go and watched as he swallowed a large oval pill. "It's for cases where an asteroid comes barreling toward you. It puts me in a position to quickly recalculate my course," he explained. Kthistlmup anxiously scrutinized Barnes's mind, which was beginning to clear. In just a moment, he would no longer be able to hide what he was thinking. It didn't matter anymore whether he was willing to answer or not. All Kthistlmup had to do was read the mental images stimulated by his questions. Barnes's mind cleared further... and Kthistlmup suddenly found himself fading away like mist in the sun. His last thought was that it had been a perfectly natural mistake.
Original title: Mistake - © 1976 Random House, Inc.

The Error of Larry Niven – Taken from "44 Microstories of Science Fiction"

On a cargo ship, suspended somewhere between Earth and Ganymede, Commander Elroy Barnes lazily settled into the shock-resistant bunk, a silly grin on his face. The curved retractable shields opened up on the ship's nose, revealing the wide, convex windows of the cockpit. Barnes looked at the stars frozen on the black velvet of the universe. A few minutes passed before he noticed the alien staring at him. He studied it with annoyance. At least two and a half meters tall, vaguely reptilian in appearance, with a dome-shaped scaly head and a mouth equipped with several dozen gleaming needle-like teeth. Instead of hands, it looked as if it had a gun. Barnes lazily raised a hand and waved. Kthistlmup was puzzled. The man's mind was confused, almost unreadable. He probed the hull looking for other minds, but the ship was empty, except for Barnes. Kthistlmup advanced into the cabin through the glass. Barnes, for the first time, seemed surprised. - Hey! Now that's a trick! Do it again. - There's something wrong with you – Kthistlmup transmitted - Barnes smirked. - Some adjustments are necessary to fight the boredom of space, to safeguard the mental health of our pilots. - He lifted a green plastic bottle, - NST twenty-four. It helps make for a good journey. There's nothing to do here until I have to navigate this heap into the Jupiter system. Why not then? - Why not what? - Why not indulge in a little trip while the big one is underway? Kthistlmup finally understood. - You've done something to your mind. Chemicals? We use DC current stimuli on Mars. - Mars? You really are... - Barnes! I'm the one asking the questions. Barnes waved his hands dismissively. - Come on then. - How prepared is Earth for an attack from space? - Oh, but that's a secret! Besides, I have no idea. - You must have some idea. What's the most powerful weapon you've heard of? Barnes crossed his arms - I won't talk. - His mind revealed only a sudden flash of white light, which might not have had anything to do with the question. Kthistlmup tried again. - Has Earth colonized other planets? - Of course! Trantor, Mesklin, Barsoom, Perelandra... Barnes's mind showed only that he was lying, and Kthistlmup lost patience. - You will talk - he threatened, advancing towards him and gently gripping his throat with four needle-sharp claws. Barnes's eyes widened. - Poor me, what a terrible trip! Quickly, hand me the bottle of Fini! Quickly! Kthistlmup loosened his grip. - Tell me about Earth's defenses! - I need to take a Fine. The big blue bottle. It should be in the medicine cabinet. - Barnes slipped sideways. He opened the cabinet on the wall before Kthistlmup could grab his wrist. - Ques