From Dr. John Grohol: Casual Fridays are alive and well at Cognitive Daily. A popular feature of this great blog are its weekly series of online experiments. Each Friday, Greta and Dave Munger design an interactive test for their readers based on research, news, theories or plain curiosity, and the following week they write up the results. For example, to see if they could predict what readers thought after a short quiz (as an unrelated web site claimed it could) readers were invited to take the survey. The next Friday they explained their methods and published graphs to deconstruct results, then invited readers to comment. The conversations in the comments can be just as provocative as the tests.