Chapter 11 in your textbook discusses IQ and where it comes from. Red and green are used in traffic lights because these are the colors that humans discriminate best. This seems reasonable. Actually, red and green are probably used more out of tradition than anything else. Chapter 5 in your textbook deals with how we sense stimuli, and you will learn an important reason why red and green may not be the best choice.
Children memorize information more rapidly than adults.
Everyone has heard this at one time or another. But, whereas children may be more open to new things than many adults, they lack an important ingredient that helps adults learn new things experience. You will read in chapter 8 about psychologists' discovery of learning sets things we have learned that help us learn new things more efficiently and effectively. We will be using some of the principles discussed in that chapter to help you learn the material throughout this course. This old saying says it all.