The Evolution of Google, An Interactive Timeline
The in-between parts are the subject of the entertaining and informative interactive graphic below. Created by OnlinePhD.org, it gives a brief story on Google's adventures since its inception; interesting tidbits and factoids; and the running total of Google users, employees, and net income over the years.
Even if you fancy yourself well-versed in Google lore, it's worth a read.
Source: Online PhD