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…showed last 75 words of 591 total…unit operations. Today there are around 70,000 chemical engineers in the U.S. During the entire history of the profession there have only been about 135,000 American chemical engineers. This means that more than a half of all the chemical engineers who have ever existed are still contributing to society today. Chemical engineering is not a profession that has to dwell on the achievements of the past for comfort, for its greatest accomplishments are yet to come.