Google provides statistical information to Google Docs customers (Cloud users, you!). By entering a keyword into the Google Trend search box, the number of searches are compared to a peak number (100) over time. Over a long time period, there can be a pattern to the general public interests. Entering several keywords gets a multiple-line graph so those terms can be compared.
Using this information can inspire new questions about a project.
For example, below I have a chart showing the pattern erupting over time for searches involving various fruits: fresh figs, fig preserves, fig bread, and fig pudding.
Notice what happens when I use fig jelly, fig bread, fig pudding:
This pattern makes me ask "What happened between June and July 2008 that suddenly made fig jelly so popular?" Remember, these are results generated from Google from the search made through them....Googling something. the keywords someone used to search a topic can easily change results since a search engine operates on two truths -- it only gives what it has, and gives what it thinks the searcher wants.
For example, in this one I search fruits: figs, apples, dates, and lemons. Look what happened:
We know Americans do not care two figs for dates, certainly not this level. If I had to bet I'd say Google interpreted 'dates' to mean 'dating' and not the oval Mediterranean fruit.