What’s a knol? It’s a new beta application from Google which allows you to be the “expert” on a subject and write an article. Similar to Wikipedia, though it focuses more on a single unit of knowledge (knol) rather than a comprehensive encyclopedia definition.
It is also a forum for advertising through creating articles for products or services (unless you are in Cuba, Iran, Burma (Myanmar), North Korea, Syria, or Sudan of course!)
Here’s a snippet from one knol.
Bruce Artwick developed the Flight Simulator program beginning in 1977 and his company, subLOGIC sold it for various personal computers. In 1982 Artwick's company licensed to Microsoft a version of Flight Simulator for the IBM PC, which was marketed as Microsoft Flight Simulator 1.00. Microsoft CEO Bill Gates was fascinated with Antoine de Saint-Exupéry's Night Flight, which described the sensations of flying a small aircraft in great detail.