Start with the familiar, and use what the audience knows to bring them to topics they want to learn more about. It often helps to start out by using a concept of biotechnology that is inclusive. If it is initially defined as applied recombinant DNA technology, most people will immediately feel disconnected from the subject matter. This opens up the discussion of how living organisms are used in our everyday lives. Both DNA and videotape are linear information tapes that carry encoded information that can be decoded, expressed, copied, spliced, and edited, and you can make copies of the edited versions.
Most people know what a radar detector is.
A little box that could fit on the dashboard, it would go off when the car goes by a place where biotechnology is used. Like a radar detector, the biotechdetector could be adjusted for sensitivity. Adjust the sensitivity to recombinant DNA and you might have to drive past a university or company doing molecular biology research to set it off. Assistance for scientists. Not all scientists are in the teaching profession, but all scientists can teach by sharing their knowledge and expertise with others.