Hi @mbrock. Take, for example, the acetaminophen study[^1] currently on the front page claiming an association between prenatal use of the drug and behavioural

Hi @mbrock. Take, for example, the acetaminophen study[^1] currently on the front page claiming an association between prenatal use of the drug and behavioural and emotional problems in children. @fifteenforty works in this area and immediately pointed out[^2] the potential cause not mentioned in the abstract: why were these women taking painkillers in the first place and could that be the cause of the developmental problems? Further down, in the Results & Conclusions, "association" implies "causal" when they mention "via an intrauterine mechanism?" [^1]: https://news.ycombinator.com/item?id=12293675 https://news.ycombinator.com/item?id=12293675 [^2]: @fifteenforty comment, https://news.ycombinator.com/item?id=12295107 https://news.ycombinator.com/item?id=12295107 Link to original study: http://archpedi.jamanetwork.com/article.aspx?articleid=2543281 http://archpedi.jamanetwork.com/article.aspx?articleid=25432... LA Times coverage: http://www.latimes.com/science/sciencenow/la-sci-sn-acetaminophen-pregnancy-behavior-problems-20160815-snap-story.html http://www.latimes.com/science/sciencenow/la-sci-sn-acetamin...