Some recent highlights (thanks to @hbdchick for hearing about many) include mere exposure effect not replicating, a bad history of hummingbird flap rates, vitamin D with/without calcium doesn't matter for bones, Alzheimer's research is bunk, no evidence for nudging, doubt on serotonin as a useful part of theory on depression (but some drugs still seem to work somehow sometimes anyway, so don't get too skeptical (but still skeptical and notice long term issues)).
An older highlight is around Koko the monkey. A lot of the flaws with Koko are repeated in small by so many published researchers, i.e. that there's just no data to even attempt an outside analysis or replication, here's another recent thread pointing this out.
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