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Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..

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This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain an..

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This tutorial investigates perception as two people can interpret the same thing differently. Know more about human perc..

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Different mental disorders are described here. Read this tutorial to get an overview of schizophrenia, affective mood di..