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The late physicist Carl Sagan, whom I quote in the first part of my title, skillfully phrased the common sense view on evidence in the mature sciences. In linguistics, however, evidence has become a controversial issue, especially so when it comes to the investigation of less well studied languages. In this paper, I argue that Sagan's principle should be applied to linguistics. The growing accessibility of a wide array of experimental techniques and computational tools to analyze such data makes it feasible to back up extraordinary claims with evidence from a variety of sources. At the same time, it is in many cases possible to agree on what constitutes an ordinary claim and focus the extra effort on extraordinary claims. For non-controversial claims no more than the minimum effort to establish the claim and properly document the evidence is necessary.