KNol , a unit of knowledge
As the name depicts its about learning with Google....
A new Google offering, its very similar to blogging but like in a usual blog visits your blog and reads it, here one can write his or her own article and can own them like an authoritative article about a specific topic.
At knol user has to visit just one page i.e. knol webpage and look for his desired article.
To publish his article a user needs to log-in using his Google Id.
Here is a link that you can check for any assistance.
Topic : Apparently there is no restriction on topic, u can even write your own post if its already been written.
Can collaborate with other authors
Language Settings: One can write in any language of his choice.
Ones post is searched by google like any other webpage..
Protocols : Do's and Don'ts.
Source : Google.com