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I trained users with varying degrees of computer knowledge on very complex software systems. I have met many interesting people with whom I had a lot in common and I especially enjoyed the training and mentoring activities. ... In times of stress, the body's feedback mechanism reacts by releasing hormones such as serotonin. That's why many people who are depressed take Prozac or other drugs to help regulate serotonin levels. Many other chemicals such as acetylcholine, ...