Air is an invisible gas as are hydrogen and helium. How can you tell if a balloon contains hydrogen? Hydrogen has particular physical and chemical properties that can be tested. Dr. Cech enlists student volunteers to show how a chemical reaction can be used to identify a substance.
The floor of a rift valley is prone to periodic floods that carry in fine silt--the sedimentary matter responsible for fossil formation.
Fossils are extremely fragile. Scientists remove them in a protective layer of plaster and clean sand away one grain at a time.
Due to the delicate nature of fossils, a hardening chemical is dripped onto every fossil before it is removed from the soil.
Katherine Sorber, a graduate student in the DeRisi lab, describes her research on malaria.
Dr. John Shea demonstrates the two main principles in the study of rock layers: superposition and association.
Dr. Tishkoff explains how studying genetic diversity can shed light on modern-day diseases, such as diabetes and obesity.
What do humans, flies, and worms have in common? More than you might think. See how transgenic organisms are engineered, and how they enable researchers to study genetic diseases.
Ben Vincent describes his summer work collecting mosquitoes for Dr. Marm Kilpatrick's research on the ecology and epidemiology of the West Nile virus.
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.
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 has the amazing diversity of plants and animals evolved? What can fossils, butterflies, and stickleback fish tell us about the deep common ancestry of all living forms?
Leading evolution educator Ken Miller discusses the controversy surrounding the teaching of evolution.
This virtual lab teaches skills of data collection and analysis to study evolutionary processes using stickleback fish and fossil specimens.
Paleoanthropology provides an excellent example of the scientific process at work.
A worksheet that guides students through The Stickleback Evolution Virtual Lab. The virtual lab lets students learn firsthand the methods for analyzing body structure in stickleback collected from lakes and fossils recovered from a quarry. Students measure, record, and...
A worksheet designed to show students how scientists make their discoveries. It provides students with background information about how Dr. Allison's work built upon the contributions made by other scientists.
A worksheet designed to actively engage students as they watch the film. Students are asked to answer questions pertaining to the information provided in the film.
To accompany the lecture series Viral Outbreak: The Science of Emerging Disease.
To accompany the lecture series Evolution: Constant Change and Common Threads.
To accompany the lecture series Scanning Life's Matrix: Genes, Proteins, and Small Molecules.
Microbes have been the dominant life form throughout Earth's history. Eukaryotes and animals evolved only after microbes evolved oxygen-generating photosynthesis.
The theory of plate tectonics took many decades to become accepted. The process by which it was finally accepted provides a fascinating glimpse into how scientists build new scientific consensus.