One thing that caught my eye is that at least of the tags included in their scatter plot, there appear to be more weekend searches than weekday searches on aver

One thing that caught my eye is that at least of the tags included in their scatter plot, there appear to be more weekend searches than weekday searches on average overall, especially for the most popular tags. (And note that the X axis is logarithmic, so those will have a much larger effect on total searches.) I wouldn't have expected that. Perhaps weekdays are more geared toward 'getting things done', so weekends are when people have time to learn.