A Question of Intelligence?

I still remember when I was a little boy, I asked my teacher a "dumb question" (as she have said) what is intelligence and where does intelligence come from ( he he he )?
She uttered, "from what part of earth did you get that question?"

As I continue my journey in achieving good status in life I encountered many trials, drastic problems, rigid hindrances and a lot more. Now that I've entered in the field of teaching (A TEACHER HUH!) I still have that question about intelligence.

I have read a lot of studies and articles about Intelligence yet, no one have given a concrete explanation of intelligence. They gave the definition, they made Standardized Tests to measure intelligence but these test are keep on changing and there have been debates how concrete and precise these tests are.

How can you say that successful lawyer is intelligent when in fact he has a broken home? How can you say that a famous doctor is intelligent when in fact he cannot cure his own illness? How can you say that a rich man is intelligent when in fact he doesn't have friends and he is not happy?

Based on educational discussions in school when i was studying it is clear to me that Intelligence Quotient is different from Emotional Quotient? But it is still a question that, if a person feels something or he uses his emotions doesn't he use his intelligence?

How about you? Can you explain intelligence? Is intelligence concrete? How can you really say that a person is intelligent. ( I know that you will use level of intelligence) But who really made this scales are they really intelligent?