A 25 year old landmark study assuring human safety around RoundUp has just been retracted, likely the most important scientific article retraction of the year.

A Study Is Retracted, Renewing Concerns About the Weedkiller Roundup
Problems with a 25-year-old landmark paper on the safety of Roundup’s active ingredient, glyphosate, have led to calls for the E.P.A. to reassess the widely used chemical.
nytimes.com