Innovations in Google are moving at the speed of light and probably Googlogy (invented word) will very soon set Google as an established science in the calibre of other enormous "logy" sciences. Think about how Google revolutionized the online search and only within a very short period of time since its inception in 1998.
The video will help you better understand how Google search works. Mutt Cutts (Google spam engineer featured in the video) will take you through a very simple step by step guide on what happens when you search in Google. I recommend that you share the video with your students as well.
For those of you interested in learning more about the digital revolution I was talking about above, I would suggest a very great book I read last month and which I will review in a separate post in the section "Book Review". The book is entitled " From Gutenberg to Zuckerbeg: What You Really Need to Know about Internet " and authored by John Naughton.