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  • Seeing Single Molecules

    Seeing Single Molecules

    Image of the Week

    Pushing the limits of light microscopy to the nanoscale, new technology allows visualization of single proteins in cells.

  • The Day the Mesozoic Died

    The Day the Mesozoic Died

    Short Film

    (33 min 43 sec) The disappearance of the dinosaurs at the end of the Cretaceous period posed one of the greatest, long-standing scientific mysteries. This three-act film tells the story of the extraordinary detective work that solved it. Also available in Spanish.

  • Classroom Activities: Molecular Menagerie

    Classroom Activities: Molecular Menagerie


    To accompany the lecture series Scanning Life's Matrix: Genes, Proteins, and Small Molecules.

  • Which Balloon Has Hydrogen?

    Which Balloon Has Hydrogen?


    (5 min 7 sec) Air is an invisible gas as are hydrogen and helium. How can you tell if a balloon contains hydrogen? Hydrogen has particular physical and chemical properties that can be tested. Dr. Cech enlists student volunteers to show how a chemical reaction can be used to identify a substance.