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As science journalists who take our job seriously, we’ve learned a couple of rules by heart: never present a correlation as a causation, always check whether a sample is representative and never rely on a single study. As the expression goes: one swallow doesn’t make a summer. These are all good starting points. But they are far from making us unimpeachable in our reporting. As a result of the third principle, we tend to rely on review studies. More specifically: