An archaeologist is a scientist who studies the ancient and recent human past through material remains. They examine artifacts found at sites of historical interest, which can range from prehistoric tools to human remains. Archaeology is a diverse field of study, and most archaeologists focus on a particular region of the world or a specific topic of study. Some archaeologists specialize in studying human remains (bioarchaeology), animals (zooarchaeology), ancient plants (paleoethnobotany), stone tools (lithics), and technologies that find, map, or analyze archaeological sites. Underwater archaeologists study the remains of human activity that lie beneath the surface of water or on coasts. Archaeologists use the scientific method to ask questions, develop hypotheses, choose a dig site, select where on the site to dig, observe, record, categorize, and interpret what they find, and then share their results with other scientists and the public. Archaeologists can work in two major sectors: as a professor or a museum curator, or in cultural heritage management, also known as cultural resource management, where they work to preserve historic and archaeological sites during development and other projects.