Yes, the most expensive and valuable is not gold or silver, or even precious stones!

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- But what ?! If not wealth! He asked, Dara .

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- Not really, knowledge! Surprised, noticed Dara .

"But they cost nothing to us . " For the same work that we do an engineer who receives $ 140 in the United States, he would receive $ 2,800 per month . And what's the point? Noticed, sarcastically, Dara .

Well, you're exaggerating everything! Knowledge is needed, and it is expensive . But not all knowledge is special, knowledge! @@