"What is" Instant Search with Google and Bing

It seems there are some rather large differences in what I get when Bing and Google do their instant search term suggestions for something as vague as “what is”:

what is bing instant search suggestions what is google instant search suggestions

These results may also imply something about how much data has been gathered and is used for my personalized versions of both searches too. However, I don’t remember searching for any of these as either a "what is" search or for any of the other search terms.

Parliament? Gout? Gluten? The Illuminati? Strange indeed, but perhaps the makings of a great mystery-thriller novel!