What`s in a Word?

This figure shows how frequently the word "Science" turns up in publications between the year 1500 and 2008. It is expressed as a frequency so it isn't an increase in the total number of books published that causes a change in the trendline.

Google has come up with either the best time waster ever, or a fantastic tool to follow trends historically. Google calls it the Ngram, it is an online tool that allows you to search for the use of single or multiple words or phrases, published in everything scanned by Google Books. The site can be found at:

http://ngrams.googlelabs.com/

It is very interesting to see how certain words or phrases compete for dominance over time. Consider the use of the terms Greenhouse Effect (red), Global Warming (blue) and Climate Change (green) between the years 1960 and 2008. Clearly the term Climate Change has won the battle, a reflection of the political effort to neuter the impact of this huge issue.

I think this tool offers an incredible number of opportunities for research regardless of your field of interest. Consider for example the changes in the frequency with which the word "Poverty" turns up in publications (1500-2008). What might be behind these changes?