There is an enormous amount of academic research in the world. And the number is growing all the time. The volume of research articles doubles every nine years. In 2010 there were already estimated to be more than 50 million research papers on pretty much every subject imaginable (and some we'd struggle to imagine).
In any one topic area there's often so much research that people wanting to rapidly understand a subject and make a decision for policy or practice cannot read up on it comprehensively.
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