Hello Socko, Let me check .. 1 knowledge , 2 knowledge ..No you can't count them that way , so probably it is an uncountable noun ,but you can gain more knowledge and search for knowledge, yet you can't have many knowledge ;) Those uncountable nouns by definition imply the state of of numerous objects or concepts,yet they are singular .Despite them not having a plural form, they indicate plurality.

http://esl.about.com/od/grammarforbeginners/a/g_cucount.htm " What are uncountable nouns? Uncountable nouns are materials, concepts, information, etc. which are not individual objects and can not be counted. information, water, understanding, etc. Uncountable nouns are always singular. Use the singular form of the verb with uncountable nouns: There is some water in that pitcher. That is the equipment we use for the project. Some uncountable nouns in English are countable in other languages. This can be confusing! Here is a list of some of the most common, easy to confuse uncountable nouns. accommodation advice baggage equipment furniture garbage information knowledge luggage news progress "

If you wish it will be countable :))

@ JieFu: Thank you for your nice words but I don't feel I deserve them as I edited the post thanks to Neal's judicious comment.

great answe by Sophie.................I learned something today from her answer..... I won't even attempt to better it!