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Showing 121-140 of 901 Resources
  • How We Get Our Skin Color

    How We Get Our Skin Color


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

  • Sand Flea Fireworks

    Sand Flea Fireworks

    Image of the Week

    The front leg of a sand flea stained with colorful dyes.

  • The Biology of Skin Color

    The Biology of Skin Color

    Short Film

    (18 min 58 sec) Penn State University anthropologist Dr. Nina Jablonski walks us through the evidence that the different shades of skin color among human populations arose as adaptations to the intensity of ultraviolet radiation in different parts of the world.

  • Look Who's Coming for Dinner: Selection by Predation

    Look Who's Coming for Dinner: Selection by Predation


    This activity supports the film The Origin of Species: Lizards in an Evolutionary Tree. Students are asked to formulate a hypothesis, and collect and analyze real research data to understand how quickly natural selection can act on specific traits in a population.  

  • Solar Fix

    Solar Fix

    Image of the Week

    The cells of the liverwort (Marchantia polymorpha) are packed with chloroplasts.

  • Tick Hiker

    Tick Hiker

    Image of the Week

    An adult female Blacklegged tick (Ixodes scapularis), commonly known as the deer tick, awaits passing wildlife. 

  • EarthViewer — Online and Downloadable Version

    EarthViewer — Online and Downloadable Version

    Click & Learn

    What did Earth look like 250 million years ago? Or 1 billion years ago? Or 4.5 billion years ago? EarthViewer is an interactive tool that allows you to explore the science of Earth's deep history. To use the app version for tablets and mobile devices, click here.

  • Shades of Pollen

    Shades of Pollen

    Image of the Week

    The variety of colors of cells in a honeycomb comes from pollen collected from different plant species.

  • Dottyback in Damselfish Clothing

    Dottyback in Damselfish Clothing

    Image of the Week

    Dottyback fish change color by altering the proportions of yellow and black pigment cells in their skin to mimic Damselfish.

  • The Art of Hiding

    The Art of Hiding

    Image of the Week

    Animal mimics evolved markings that make them look either like other animals or inanimate objects.

  • Mapping a Kidney’s Tubes

    Mapping a Kidney’s Tubes

    Image of the Week

    An intricate system of tubes in the kidney filters out waste products from the blood.

  • Save Our Sawfish

    Save Our Sawfish

    Image of the Week

    A smalltooth sawfish (Pristis pectinata) patrols the murky waters of the Everglades National Park in Florida.

  • Warthog Love

    Warthog Love

    Image of the Week

    Warthog mothers look after their young in small family groups.

  • Exploring Biomes in Gorongosa National Park

    Exploring Biomes in Gorongosa National Park


    Gorongosa National Park in Mozambique is a region with high ecological diversity that encompasses two distinct biomes. This activity introduces students to the concept of biomes in conjunction with the Gorongosa National Park interactive map click and learn

  • Working On The Ant Farm

    Working On The Ant Farm

    Image of the Week

    Leaf-cutter ants practice fungus agriculture to provide the ant colony with a steady source of food.

  • Coral Temperature Data

    The table below provides links to the data files for the 28 coral reef locations used in the activity. Click on a link to download the temperature data for that site. Use the ZIP file at the top of...

  • Coral Bleaching Activity

    Coral Bleaching Activity


    This is a classroom activity in which students use authentic data to assess the threat of coral bleaching around the world. It supports the 2014 Holiday Lectures on Science video featuring Dr. Stephen Palumbi.

  • Following Tracks In The Sky

    Following Tracks In The Sky

    Image of the Week

    The flight patterns of a flock of black vultures are revealed by a novel digital video technique.

  • Icefish Film with Quiz

    Icefish Film with Quiz

    Interactive Video

    (13 min 14 sec) Embedded quiz modules test students’ understanding as they watch the short film on the icefish—an example of how genes are reused and recycled.

  • Synchronized Division

    Synchronized Division

    Image of the Week

    The early embryonic cells of the sand dollar are caught in the act of synchronized cell division.

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