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Hypothesis: Echinacea reduces the duration and severity of the symptoms of the common cold.SECOND EDITIO N A GUIDE TO BIOLOGY Phelan FM iii 9/20/11 PM This page intentionally left blank v B R I E F C O N T E N T S PART 1 The Facts of Life 1 Scientifi c Thinking | Your best pathway to understanding the world . In our initial discussion of experiments, we just described what the experiment was without examining why the researchers chose to perform the experiment the way they did. Rather, they are hypotheses— proposed explanations for natural phenomena—that have been so strongly and persuasively supported by empirical observation that the scientifi c community views them as very unlikely to be altered by new evidence. A theory can be thought of as a hypothesis that has withstood the test of time and is unlikely to be altered by any new evidence. Theory A theory is an explanatory hypothesis for natural phenomena that is exceptionally well supported by the empirical data.