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ATP Synthesis

This animation shows how the proton gradient across the mitochondrial membrane powers the ATP synthase enzyme to make ATP. It is the third of three animations about cellular respiration.

Electron Transport Chain

This animation shows how the enzyme complexes of the electron transport chain harvest energy from cofactor molecules to pump protons across the mitochondrial membrane and establish a chemical gradient. It is the second of three animations about cellular respiration.

Citric Acid Cycle

This animation shows the reactions of the citric acid cycle, which splits off carbon atoms and generates energy-rich reduced forms of cofactor molecules. It is the first of three animations about cellular respiration.

Animated Life: The Living Fossil Fish

This animated short video tells the story of the discovery of the coelacanth, a species that belongs to a group of lobe-finned fish that existed 400 million years ago.

Animated Life: Mary Leakey

This animated short video illustrates the life and work of paleoanthropologist Mary Leakey, including her discovery of the Laetoli footprints.

The Origin of Flight: What Use Is Half a Wing?

In this video, biologist Ken Dial demonstrates that birds use their wings for more than just flying, which may help us understand how dinosaurs used their small wing-like limbs before the evolution of flight.

Your Inner Monkey

This film explores what human hands, vision, and brains reveal about our evolution from ancient primate ancestors.

Your Inner Fish

This film explores how the genetic and anatomical legacy of a fish can be seen today in the human body.

Your Inner Reptile

This film explores what our hair, teeth, and hearing reveal about our evolution from ancient reptilian ancestors.

The Tool-Making Animal

This video describes how stone tools reveal a critical transition in the lives of our early human ancestors.

Great Transitions: The Origin of Birds

This film follows paleontologist Julia Clarke as she describes some of the most important fossil evidence showing that birds descended from dinosaurs.