Anthropology is the study of what makes us human. To understand the full sweep and complexity of cultures across all of human history, anthropology draws and builds upon knowledge from the social and biological sciences as well as the humanities and physical sciences. Some anthropologists consider what makes up our biological bodies and genetics, as well as our bones, diet, and health. Others look to the past to see how human groups lived hundreds or thousands of years ago and what was important to them. Around the world, they observe communities as they exist today, to understand the practices of different groups of people from an insider’s perspective. And they study how people use language, make meaning, and organize social action in all social groups and contexts.