Audio Knols

Google Knol tests a cool feature that automatically converts articles to audio files, which can be played or downloaded. For now, the option is available for a small number of knols, like this one about multiple sclerosis.

"We are experimenting with Audio Playback as an option for some knols, starting with a handful of English language featured knols. If this experiment is successful, we may make Audio Playback available to more knols in additional languages, and additional features," mentions a Knol help page.


Hopefully, Google will add support for text-to-speech conversions to other services like Google Docs, Google Reader or Google Book Search.

More Internal Links in Google Knol

Knol, Google's knowledge repository, has recently improved the way articles are interlinked. When you create a link, Knol shows search results for the selected text, promoting its own content.


Some knols include an automatically-generated list of related knols in the sidebar:


Unfortunately, it's hard to find high-quality articles other than the knols featured on the homepage. The top search results for [Yahoo], [marine biology], [Alan Turing] and many other popular queries are articles copied from Wikipedia. Knol could easily filter these articles from search results, especially considering that Wikipedia has a conflicting license.

Did you spot any interesting knols? I found a well-documented history of Arctic explorers, a tutorial about photography composition and an introduction to usability.

Useful links:
* Knol's changelog
* the most visited knols

Knol's Advanced Search

Knol has recently added a search toolkit that lets you build advanced queries, a feature that wasn't available at launch. Many of the options from Google web search can be used in Knol: phrase search, negative terms, OR search. You can also restrict the search to titles, summaries, authors, reviews, recent knols. Google offers three options for ordering the results: by relevance, by creation date, by last modified date and an interesting "reverse sort".


The advanced search option should be a good way to discover knols related to a topic, but it fails to properly rank the knols. In a search for [Google Reader], the top result is a page copied from Google Reader's help center that has a higher rating than the second result, which is more relevant. If you don't use the advanced search, Knol shows less but better results.

A search for [the] returns 29315 results (507 edited in the past 24 hours), which should be close to the total number of knols, but many of them include content that already exists on the web, aren't very detailed or well-formatted. You can still find some good knols, but the signal-to-noise ration seems to be low. The knols that receive some attention are those that are featured on the homepage, but Google only features 5 hand-picked knols daily.

Share Your Expertise in Google's Knol

Knol is a new Google service created for sharing knowledge. The service has been announced in December 2007 and it's now publicly available.

Knol has much more in common with Squidoo and HubPages than with Wikipedia. The service is centered around authors: each Knol article displays the name of its author and links to a small biography. Google even lets you verify your identity, but this only works if you live on the US.


Knol doesn't intend to become an encyclopedia, so there's no single article about a topic. An author can write about almost any topic, but it's recommended to write authoritative content.

There are three levels of collaboration in Knol:

* open collaboration (any Knol user can edit the article)
* moderate collaboration (any Knol user can suggest changes to the article - enabled by default)
* closed collaboration (only the co-authors can edit the article)

Google uses a rich-text editor borrowed from Page Creator, so it's much easier to edit knols than Wikipedia articles. Users can rate the articles, add comments and write reviews, much like for scholarly works.


By default, articles are licensed as Creative Commons Attribution, but you can change the license in the settings. It's nice to see that Google encourages the use of flexible licenses that allow content reuse.

Like in Blogger, Google provides an option to monetize your articles using Google AdSense, but the ads are displayed in a fixed position. Knol doesn't let you customize the layout of the page and you can't add JavaScript code, objects or iframes.

Search Engine Land says that Knol is a service created by Google's search quality team. "I do believe [Knol] does solve a search problem. The problem we have, unlocking what people know and bringing it online. This is another tool to help release some of this knowledge," explains Cedric Dupont, the product manager for Knol.

While Google has many other services that allow people to share their knowledge (Blogger, Google Docs, Google Sites), Knol encourages experts to make the search results better by sharing what they know. After all, Knol articles are indexed by search engines and Google promises to not give them preferential treatment.

"Your name is behind your knol, and it should reflect your unique point of view. Be succinct, but comprehensive on your topic of choice. Provide references, and display your credentials. Readers will want to know who you are and gain context on the knols you are writing." - these are some of the guidelines for writing good Knol articles.

I think that Google managed to develop a very solid service with a lot of interesting features that encourage originality (a list of web pages with similar content), a sense of ownership (your name is included even in the URL) and information accuracy (peer reviews and suggested edits).


Update. Some example of knols: How to Backpack, Buttermilk Pancakes, Type 1 Diabetes, A Distributed Document Repository.