Google launches Knol : a unit of knowledgeKnol is new service by Google, an authoritative article about a specific topic. Though, as of now its mostly about medical and health articles.

Google says,

The key principle behind Knol is authorship. Every knol will have an author (or group of authors) who put their name behind their content. It’s their knol, their voice, their opinion. We expect that there will be multiple knols on the same subject, and we think that is good.

A feature called “moderated collaboration” is introduced for authors to work together. With this feature, any reader can make suggested edits to a knol which the author may then choose to accept, reject, or modify before these contributions become visible to the public. This allows authors to accept suggestions from everyone in the world while remaining in control of their content.

Knols include strong community tools which allow for many modes of interaction between readers and authors. People can submit comments, rate, or write a review of a knol. At the discretion of the author, a knol may include ads from our AdSense program. If an author chooses to include ads, Google will provide the author with a revenue share from the proceeds of those ad placements.

Link : Knol : A knol is an authoritative article about a specific topic.