Life In A Test Tube? Or Jumping To False Conclusions?A presupposition occurs when we make an exclusive statement that depends on a questionable assumption as opposed to a genuine fact. Ironically, one fond memory I have that involves a presupposition comes from my high school science class. I can still remember my sophomore biology teacher expounding with the utmost glee and detail on Stanley Miller’s famous spark-discharge experiments at the University of Chicago. Working under Nobel laureate Harold Urey, Miller recreated what was presupposed as Earth’s primitive gaseous environment, then passed electricity through the mixture to simulate lightning. In doing so, Miller found he had created amino acids, the basic building blocks of protein, and ultimately, life.