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  • How We Get Our Skin Color

    How We Get Our Skin Color

    Animation

    (3 min 32 sec) This engaging animation shows how human skin cells produce the pigment melanin, which gives skin its color. 

  • Ocean Species Respond to Climate Change

    Ocean Species Respond to Climate Change

    Lecture

    (29 min 39 sec) Coral reefs, how they are threatened by climate change, and how to protect them.

  • Perfect Daughters

    Perfect Daughters

    Image of the Week

    Chromosomes change form as a cell divides to ensure that each daughter cell gets a full, intact copy of the genome.

  • HIV life cycle

    HIV life cycle

    Animation

    (4 min 52 sec) How HIV infects a cell and replicates itself using reverse transcriptase and the host's cellular machinery.

  • Understanding Embryonic Stem Cells

    Understanding Embryonic Stem Cells

    Lecture

    (58 min 27 sec) An overview of embryonic development, the progressive differentiation of cells, and properties of embryonic stem cells.

  • Sex and Death: Too Much of a Good Thing

    Sex and Death: Too Much of a Good Thing

    Lecture

    (59 min 6 sec) Having too many chromosomes can lead to too much gene expression. Dr. Meyer explains how the gene that controls dosage compensation in C. elegans works.

  • Hermaphrodites: The Safer Sex

    Hermaphrodites: The Safer Sex

    Lecture

    (56 min 32 sec) Dr. Barbara Meyer explains the value of studying model organisms and introduces the nematode C. elegans.

  • Clockwork Genes: Discoveries in Biological Time

    Clockwork Genes: Discoveries in Biological Time

    Lecture

    Four lectures highlight the research of two scientists who have made groundbreaking discoveries elucidating the molecular basis of circadian clocks—the internal timekeepers that govern fluctuations in behavior and physiology on a 24-hour cycle.

  • How Immune Cells Create Trillions of Receptors from a Few Hundred Parts

    How Immune Cells Create Trillions of Receptors from a Few Hundred Parts

    Lecture

    (59 min 48 sec) The human body has at least a trillion ways of recognizing that something foreign has invaded.

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