This is Part 4 of a 5-part science series prepared by Dr. Duane Ray. “We build on our knowledge of DNA, epigenetics, and molecular interactions to look at some amazing new developments in biology. The application of new biological understanding has led to big changes in the way we produce our food, treat our illnesses, and even produce our energy. Genetic engineering and stem cell work have expanded dramatically in the last few years. Ethical concerns lead to emotional discussions. The potential benefits for everyone drive the research forward. As we learn more about each of these areas, we have a better foundation for understanding the headlines.”