" I have spent these last two days in concentrated introspection," said Cutie, " and the results have been most interesting. I began at the one sure assumption I felt permitted to make.I, myself, exist, because I think-" Powell groaned, " Oh, Jupiter, a robot Descartes!" " Who's Descartes?" demanded Donovan. " Listen, do we have to sit here and listen to this metal maniac-" " Keep quiet, Mike!" Cutie continued imperturbably, " And the question that immediately arose was: Just what is the cause of my existence?" Powell's jaw set lumpily. " You're being foolish. I told you already that we made you." " And if you don't believe us," added Donovan, " we'll gladly take you apart!" The robot spread his strong hands in a deprecatory gesture, " I accept nothing on authority. A hypothesis must be backed by reason, or else it is worthless - and it goes against all the dictates of logic to suppose that you made me." Powell dropped a restraining arm upon Donovan's suddenly unched fist. " Just why do you say that?" Cutie laughed. It was a very inhuman laugh - the most machine-like utterance he had yet given vent to. It was sharp and explosive, as regular as a metronome and as uninflected." Look at you," he said finally. " I say this in no spirit of contempt, but look at you! The material you are made of is soft and flabby, lacking endurance and strength, depending for energy upon the inefficient oxidation of organic material - like that." He pointed a disapproving finger at what remained of Donovan's sandwich. " Periodically you pass into a coma and the least variation in temperature, air ressure, humidity, or radiation intensity impairs your efficiency. You are _makeshift_." I, on the other hand, am a finished product. I absorb electrical energy directly and utilize it with an almost one hundred percent efficiency. I am composed of strong metal, am continuously conscious, and can stand extremes of environment easily. These are facts which, with the self-evident proposition that no being can create another being superior to itself, smashes your silly hypothesis to nothing. "