In tenth grade, Andrea Hill's algebra II/trigonometry teacher told her in front of her entire class that she was not "smart enough" to attain her dream -- to be an engineer. Instead of being totally embarrassed and crawling into a hole never to be seen again, as many young teenagers might have considered doing, Hill vowed to get the highest grade in the class. When the final exam grades were posted that semester, her eyes scanned the sheet, and her single word response was "Yes!"