Environmental and cultural factors can affect whether a new human mutation becomes common in a population.
The floor of a rift valley is prone to periodic floods that carry in fine silt--the sedimentary matter responsible for fossil formation.
Due to the delicate nature of fossils, a hardening chemical is dripped onto every fossil before it is removed from the soil.
Chimpanzees are capable of using rocks as tools to crack nuts for eating. But they don't appear to use sharp-edged tools.
African rift valleys were formed by the separation of tectonic plates. Water flows down to the valley floors, creating rivers and lakes.
Prehistoric stone tools are classified into six broad technological modes by the level of sophistication and method of fabrication.
Where and when did humans arise? What distinguishes us from other species? Did our distant ancestors look and behave like us?
How reasoning and evidence are used to understand human evolution.
Genetic evidence shows that humans evolved in Africa and continue to evolve.
Stone tools are well-preserved evidence of past human activity.
The hominid fossil record of the past six million years gives us surprising insights into the path of human evolution.
How humans perceive bitter taste, and the evolution of taste perception.
This Click and Learn explains how DNA sequences can be used to generate such trees, and how to interpret them.
Comparing features of a 4.4-million-year-old fossil skeleton to those of human and chimpanzee skeletons sheds light on our evolutionary history.
Lactose tolerance, sickle cell anemia, and bitter taste perception are three examples of recently evolved human traits.
Lactase persistence results from a mutation that changes how transcription factors interact, thereby affecting gene expression.
Paleoanthropology provides an excellent example of the scientific process at work.
The poster from the 2011 Holiday Lectures on Science, Bones, Stones and Genes: The Origin of Modern Humans. It provides a unique look at the classic "tree of life" and features a timeline of various hominid fossils and their stone tool usage.
A text transcript of the 2011 Holiday Lectures on Science, Bones, Stones, and Genes: The Origin of Modern Humans.