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You do not need to be a rocket scientist. Americans hear these words often. People say them in schools, offices and factories. Broadcasters on radio and television use them.This is how you might hear the words used.Workers in an office are afraid to try to use their new computer system. Their employer tells them not to be foolish. You do not need to be a rocket scientist to learn this, he says.Or, high school students cannot seem to understand something their teacher is explaining. Come on, she says. You do not need to be a rocket scientist to understand this.Or, a company that makes soap is trying to sell its product on television. You do not need to be a rocket scientist to see that our soap cleans better, the company says.These words send a strong message. They say that you do not need to be extremely intelligent to understand something.How did the expression beginNo one seems to know for sure. But an official of the American space agency, NASA, says the expression just grew. It grew, he says, because rocket scientists probably are the most intelligent people around.Not everyone would agree.Some people might be considered more intelligent than rocket scientists. For example, a person who speaks and reads fifteen languages, or a medical doctor who operates on the brain.