Google's Knol encyclopedia site open to public

After seven months as an invitation-only site, Knol is opened for business this week.

Anyone with a Google log-in will be able to submit articles.

Unlike Wikipedia, Knol requires authors to identify themselves to help determine the source's credibility.

Knol users can also cash in on their entries. If you submit an article, you can have ads displayed on the page.

Google shares any money generated from the ads with the authors.