Social psychology is the scientific study of how people think about, influence, and relate to one another. It focuses on individuals and uses experimentation, compared to sociology which focuses more on groups. Some key questions social psychology asks include how much of our social world is in our heads, whether people would be cruel if ordered, and when people are motivated to help versus help themselves. Social psychology's big ideas can be boiled down to a few central themes, including that we construct our own social reality, our social intuitions are often powerful but sometimes perilous, and attitudes shape and are shaped by our behavior.