The doctrine of evidence-based medicine was proposed in a paper in 1992. The Cochrane Collaboration was founded in 1993 and over time made meta-analysis authoritative papers.
The Student's t-test paper was published in 1908 and in the 1920's the statistical signifiance as measured by t-test wasn't central to science the way it is today.
In 1920 Freud was considered doing scientific psychology. As far as I know the General Semantics community is like the Freudian community in the regard that they didn't try to back up specific interventions in controlled trials.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.