| http://www.w3.org/ns/prov#value | - Also adults get a lot of knowledge through books, because they are a very useful way for saving it, a very useful way also for forwarding it, there is a proverb that says : the best freind is you book.The second source of knowledge wich I think is more important is experience, it gives your real life situations, and make you experiment all what you have learned in books, take for example physics
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