Howard Hughes Medical Institute
Survey Methods
How many African elephants are on earth? How do scientists answer a question like that? An interactive resource explains a variety of survey methods and their advantages and disadvantages. It connects the need for a survey to...
Howard Hughes Medical Institute
Human Skin Color: Evidence for Selection
Skin color is controlled by at least six genes. Young scientists learn about skin colors through a documentary. They discuss the topics of pigment, natural selection, and vitamin D absorption. They apply their knowledge to higher order...