Allopatric Speciation

These images from the Smithsonian Institution depict Nancy Knowlton's work with snapping shrimp in Panama. Knowlton found that the closing of the isthmus -- dividing the Pacific Ocean from the Caribbean -- resulted in new species of shrimp.

American Chestnut Tree

This annotated slideshow adapted from KET's Electronic Field Trip to the Forest illustrates how blight decimated the American chestnut tree and the methods scientists use to identify and pollinate the remaining trees to create blight-resistant trees.

Animal Classification Game

Learn about classes of animals and test your ability to identify animals as mammals, birds, reptiles and more in this interactive activity adapted from Sheppard Software.

Build-a-Fish

In this interactive activity from Shedd Aquarium, build a fish and then release it into the reef to search for food and evade predators. Try different combinations and observe how each kind of fish has unique adaptations that help it survive in its habitat.

Carnivorous Plants of Cartwheel Bay

In this video segment from NatureScene, explore Cartwheel Bay, a wetland in South Carolina, and learn about the variety of carnivorous plants native to this unique landform.

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Caves: Extreme Conditions for Life

This video segment adapted from NOVA raises the provocative idea that if life can exist in the most extreme environments on Earth — such as in dark, toxic caves — then perhaps living things can also survive in harsh environments on other planets.

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Chimp Politics

In this video from the PBS series The Human Spark, host Alan Alda and scientist Franz de Waal observe and compare two alpha-male chimpanzees’ different approaches to sharing at the Yerkes National Primate Research Center in Atlanta.

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Climate and Human Evolution

In this video segment adapted from NOVA: "Becoming Human," learn how the analysis of rock layers and ocean sediments supports the theory that rapid climate change may have jump-started human evolution two million years ago.

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Comets Bombard the Early Earth

Visualize how comets carrying chemicals necessary for life could have made their way to Earth billions of years ago in this video segment adapted from NOVA.

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Comets Deliver Amino Acids to Earth

Amino acids, essential ingredients for life, may have been delivered to Earth by comets billions of years ago, as visualized in this video segment adapted from NOVA.

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The Common Genetic Code

Paul Nurse describes his research that showed that humans share some genes with organisms as different from us as simple brewer's yeast. Footage from Secret of Life: "Immortal Thread."

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Continental Divide: The Breakup of Pangaea

Examine geological evidence found in fossils, rock deposits, and ancient mountains that supports the theory of continental drift in this interactive activity adapted from the Exploratorium.

A Day in the Life of a Neanderthal

In this video segment from The Human Spark, host Alan Alda looks at some of the similarities and differences between the Neanderthal way of life and that of modern humans.

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Decision-Maker Bees and the Human Brain

Learn about the similarity between the pattern of communication within a bee colony and neural networks in the human brain, in this video adapted from NOVA scienceNOW.

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The Developing Brain

This video from The Human Spark illustrates the difference between the brain growth of man’s early ancestors and today’s modern infant.

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Dinosaurs

This video segment from IdahoPTV's D4K shows us what paleontologists think dinosaurs looked like, what they ate, and why they might have disappeared. We see paleontologists at work studying dinosaurs fossils.

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Dragonflies in Kentucky

This KET video segment from Kentucky Life explains the differences between dragonflies and damselflies and explores their habitats.

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Engineering Biofuels

In this video segment adapted from KQED's QUEST, find out how synthetic biologists use the techniques of metabolic engineering and directed evolution to make more effective biofuels.

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Evolutionary Roots of Language

This video excerpt from NOVA scienceNOW looks at how language and tool-making may have coevolved.

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The Falls of the Ohio

This video from KET examines one of the largest exposed fossil beds in the world, found at the Falls of the Ohio River, near Louisville, Kentucky.