There are many interesting knols. But there is no way of finding them in one location. Knol authors were not having information about them.
Knol Search Directory of Interesting Knols assembles them in a single page.
The page has knol search links for various categories. Under each category there are further search links for each year. In total there can be 25,000 interesting knols in English language. In all other languages, there can be equal number of interesting knols thus making the total number of interesting knols equals to 50,000. Now some knol authors can take up activities to market these 50,000 knols and get around 250,000 page views for them daily.
Knol is likely to accumulate million knols in a year or so and by then the number of interesting knols can increase to 100,000.