This short "article" from some people at NCSA is pathetic. Let's pass on the fact that they can't spell the word "comparison". About half way down in the "Methodology" (sic) section, you will read this:
In order to create a large number of queries that returned less than 1,000 results, we took the commonly available English Ispell Wordlist (a total of 135,069 words) [3] and wrote a PERL script to randomly select two words at a time from that list.
English? So, we're back in 1994 then?
(Update: they fixed the typo).