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  • Bat Echolocation

    Bat Echolocation

    Data Points

    In this study, researchers tested whether bats change their behavior while hunting based on feedback from echolocation.

  • How Animals Use Sound to Communicate

    How Animals Use Sound to Communicate

    Click & Learn

    Using elephants, finches, bats, and moths, as case studies, explore different aspects of how animals use sound to communicate.

  • How We Get Our Skin Color Interactive

    How We Get Our Skin Color Interactive

    Interactive Videos

    (3 min 32 sec) This interactive animation about the biology of skin color provides stop points at which students can further explore the material through additional text and illustrations, videos, questions, and simple interactive widgets.

  • Film Guides: The Double Helix

    Film Guides: The Double Helix

    Film Guides

    The following classroom-ready resources complement The Double Helix. This short film describes the evidence that led James Watson and Francis Crick to the discovery of the double-helical structure of DNA and how the structure immediately revealed how genetic information is stored and inherited.

  • Lactose Intolerance: Fact or Fiction

    Lactose Intolerance: Fact or Fiction

    Activities

    Students evaluate and discuss several statements about lactose intolerance and evolution before and after watching the film. Also available in Spanish.

  • Following the Trail of Evidence

    Following the Trail of Evidence

    Activities

    A worksheet in which students write down the evidence that led to the discovery that an asteroid struck Earth about 66 million years ago, causing a mass extinction. Also available in Spanish.

  • Ice Crystal Formation in Icefish and Non-Icefish Blood

    Ice Crystal Formation in Icefish and Non-Icefish Blood

    Activities

    A dramatic demonstration that simulates how tiny ice crystals would form and grow in the blood of most fish if they ventured into the icy waters of the Antarctic.

  • Demonstration: Viscosity of Icefish and Non-Icefish Blood

    Demonstration: Viscosity of Icefish and Non-Icefish Blood

    Activities

    A simple demonstration that uses readily-available materials to simulate how blood pumps through the circulatory system of icefish and other fish.

  • Icefish Adaptations

    Icefish Adaptations

    Activities

    A simple activity that investigates the importance of antifreeze proteins to icefish survival.

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