Its like they're asking google a question as if it were a person, rather than a computer program that looks for specific words in web pages. Instead of "how come there are microbes living in yellowstone's hot springs", it would be better to put in just "microbes yellowstone hot springs" or something...I know a lot of people use google that way though...

I put searches in the form of a question quite often, because it usually leads to pages on which someone else has asked the same question, and hopefully has had it answered.