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  • Coloring the Past

    Coloring the Past

    Image of the Week

    An electron micrograph of tightly-packed melanosomes in a 55.4-million-year-old fossil bird feather unearthed in Denmark.

  • How We Get Our Skin Color Interactive

    How We Get Our Skin Color Interactive

    Interactive Video

    (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.

  • What Makes Flowers Red?

    What Makes Flowers Red?

    Image of the Week

    The petals of flowers get their vibrant colors from cells packed with pigments such as orange carotenoids and pink anthocyanins.

  • Diffusion Across Membranes

    Diffusion Across Membranes


    (4 sec) This animation describes two different ways by which chemicals migrate through membranes: passive diffusion and active transport.