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  • Bat Echolocation

    Bat Echolocation

    Data Point

    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.

  • Film Guides: The Double Helix

    Film Guides: The Double Helix

    Film Guide

    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.

  • Determining the Size and Energy of the K-T Asteroid

    Determining the Size and Energy of the K-T Asteroid

    Activity

    A lesson in which students calculate the mass, size, and kinetic energy of the K-T asteroid based on the total abundance of iridium in the K-T boundary layer.

  • Following the Trail of Evidence

    Following the Trail of Evidence

    Activity

    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.

  • Calculating Iridium Fallout From an Asteroid Impact

    Calculating Iridium Fallout From an Asteroid Impact

    Activity

    A worksheet in which students calculate how much iridium was released, and eventually deposited all over the Earth, by the impact of the asteroid that caused the K-T extinction.

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