Knowledge is simply the quantitative measure of how much you know, and in order to store and retrieve that knowledge you would first need some form of language. Which from this we can deduce that the first level of knowledge is language.
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To our knowledge between 1446 & 1406 B.C
As far as current knowledge goes, it was in Asia
You must first pass a Health and Safety Test, but from that point it depends on the card level and type. The basic level only requires that you are working towards some sort of qualification. The higher level cards require that you have completed a qualification.
She is a wealth of knowledge.
An encyclopedia contains a wealth of knowledge. A wealth of knowledge is in an encyclopedia.