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graphic of an evidence hierarchy

Evidence hierarchies, one version shown, classify types of studies according to the strength of evidence they provide. But a recent paper challenges the assumptions behind these hierarchies.

Asian tiger mosquito

WATCH OUT The Asian tiger mosquito (shown) is an unloved invader in much of the world, but now a bad-dad version is about to be commercially launched as a living tool to control populations of the pests.

hands holding a gun

GUN WOUND BURDEN  A new study estimates there were roughly 25 visits to the emergency department for gun-related injuries per 100,000 people from 2006 to 2014.

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