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  • 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.

  • Calculating Iridium Fallout From an Asteroid Impact

    Calculating Iridium Fallout From an Asteroid Impact

    Activities

    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.

  • Distribution of Elements in Earth’s Crust

    Distribution of Elements in Earth’s Crust

    Activities

    A lesson in which students read a passage and answer questions about the information presented, testing their non-fiction reading comprehension.

  • Chemical Signatures of Asteroid Impacts

    Chemical Signatures of Asteroid Impacts

    Activities

    A lesson in which students analyze the chemical data that led researchers to conclude that the K-T boundary layer contained an extraordinary concentration of iridium. 

  • 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.

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