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Floods, Droughts, and Food Chains

In this talk, ecologist Mary Power discusses how a river's community of herbivores and predators is affected by changes in river flow.

Africa's Savanna Ecosystems

In this talk, ecologist Robert Pringle discusses how patterns and processes that occur in the savanna, a globally important biome, illustrate core concepts in ecology.

Learning from Past Extinctions

In this talk, biologist Anthony Barnosky discusses Earth’s five mass extinctions and whether current species declines may be part of a sixth mass extinction.

Cancer as a Genetic Disease

In this talk, biomedical scientist Charles Sawyers discusses how understanding the mutations that cause cancer can guide the development of targeted drug therapies.