This lesson is part of evolution unit which follows heredity and genetics The lesson is interdisciplinary in nature in that I discuss the concept of race as a social construct and the idea that there are “black, white, red, yellow” skinned people is something that people developed. It is not based on biology. Race groupings are human-made groups. Students first learn about mixing light and how to determine black and white from an ADI analysis. They learn that red and green = yellow, etc. They then photograph each other’s forearms and analyze the images using ADI. We then discuss skin color as an adaptive advantage. I reinforce the idea that people’s skin color (before there was sunscreen, folic acid, and Vitamin D supplements) was an adaptation which enabled people to survive. I point out to the students that they come from a long line of WINNERS (otherwise they wouldn’t be here!