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Engineers are inventors, designers, and creators—they apply science, math, and imagination to make dreams a reality. As they work to craft technical solutions to consumer and societal needs, engineers bridge the gap between scientific ideas and commercial applications. The subfield of aeronautical engineering involves designing, developing, testing, and overseeing the building of flight-capable machines, such as aircrafts and spacecrafts. For the past 40 years, aeronautical engineer Paul Moller has been working to make his dream—a flying car—take off.