Here's a good rule of thumb for interpreting science news

You've probably seen it before: a headline that goes something like "Study: caffeine gives you brain cancer." And you think, What, really? Such results are often followed by a similar headline a few months later with the exact opposite result. How do we sort through this endless stream of science?

Aaron Carroll's most recent video suggests some useful tools for this purpose. He tells us about meta-analyses, which are studies built on previously done studies. By combining data, one can increase statistical power and perhaps uncover new results. Many of the most counterintuitive studies — and therefore most widely reported — are meta-analyses. Here are some tips to keep in mind:

Therefore, one should generally approach a new meta-analysis with a wary eye. They're an important tool, but not infallible. Watch the full video explanation below. --Ryan Cooper

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