Unit 1: Many Planets, One Earth // Section 10: Further Reading
University of California Museum of Paleontology, Web Geological Time Machine, http://www.ucmp.berkeley.edu/help/timeform.html. An era-by-era guide through geologic time using stratigraphic and fossil records.
Science Education Resource Center, Carleton College, "Microbial Life in Extreme Environments," http://serc.carleton.edu/microbelife/extreme/index.html. An online compendium of information about extreme environments and the microbes that live in them.
James Shreve, "Human Journey, Human Origins," National Geographic, March 2006, http://www7.nationalgeographic.com/ngm/0603/feature2/index.html? fs=www3.nationalgeographic.com&fs=plasma.nationalgeographic.com. An overview of what DNA evidence tells us about human migration out of Africa, with additional online resources.