Gallery of Visual Illusions

Are your eyes playing tricks on you? Discover more about eyesight and the brain as you test your eyes with these visual illusions adapted from the University of Washington's Neuroscience for Kids Web site.

Gas Properties

In this interactive simulation adapted from University of Colorado’s Physics Education Technology project, change parameters and discover how the properties of a gas vary in relation to each other.

Geology of Death Valley

This video segment from NatureScene examines the landforms of Death Valley and how they came to be.

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Geology of North Dakota Badlands

See how the geology of the North Dakota badlands has changed over time in this video segment from NatureScene, featuring the landscape at Theodore Roosevelt National Park.

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Geometric Optics

This interactive simulation adapted from the University of Colorado's Physics Education Technology project illustrates how lenses refract light to form images. Manipulate the object, screen, lens, and focal length and observe how the image adjusts.

Geothermal Power

This video segment from Vegas PBS shows the important role geothermal energy systems can play in making a more energy-efficient and greener building.

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Gila Monster

This video segment from Outdoor Nevada looks at the Gila monster's behavior, habitat, and unique adaptive characteristics.

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Global View of the Seasons

This interactive activity produced for Teachers' Domain features satellite data of Earth's seasonal cycles. Visualizations and comparative still images reveal how successfully plants are photosynthesizing at different times of the year.

Global Warming: Carbon Dioxide and the Greenhouse Effect

This video segment adapted from NOVA/FRONTLINE demonstrates the physical property of carbon dioxide that causes the greenhouse effect.

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Global Warming: Carbon Dioxide and the Greenhouse Effect

This video segment adapted from NOVA/FRONTLINE demonstrates the physical property of carbon dioxide that causes the greenhouse effect.

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Great Ocean Conveyor Belt: Part I

This image from GRID-Arendal depicts the major circulation pattern of the ocean, illustrating interactions between temperature, salinity, and depth.

Greenland Ice Sheet Project 2: A Record of Climate Change

Using images and graphs, this interactive resource illustrates scientists' efforts to study Earth's climatic history for the last 250,000 years by drilling into the Greenland Ice Sheet and examining ice cores. Adapted from the Wright Center for Science Education, Tufts University.

The Habitable Zone

This illustration is an approximate representation of the planets in our solar system and their relation to what scientists call "The Habitable Zone." The planet distances from the sun are measured in Astronomical Units (AU) and are not to scale.

Heat Transfer

In this interactive activity adapted from the Wisconsin Online Resource Center, learn how heat can be transferred in one of three ways: conduction, convection, and radiation.

Helium Is Boring

In this video adapted from the National Science Center, observe a demonstration to discover how helium gas is inert and hydrogen gas is reactive.

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Homo Sapiens Versus Neanderthals

This video segment, adapted from NOVA, explores reasons why Homo sapiens had an advantage over Neanderthals in the pursuit of territory and natural resources.

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Horned Lizard

In this video from Outdoor Nevada, learn about the habitat, diet, and defense mechanisms of horned lizards.

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How DNA Evidence Works

In this article by An Meeker-O'Connell, discover how DNA evidence is processed before it goes to court.

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How Would You Turn a Bolt in Space?

In this fast-paced NASA Brain Bites™ video, an astronaut demonstrates the impact of microgravity on the use of tools in space.

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Hubble Telescope: Looking Deep

This video segment adapted from the Space Telescope Science Institute shows what the Hubble telescope found when it stared at a single, nearly empty spot in the sky for 10 days in 1995. The unexpected result was a picture of a multitude of galaxies stretching into the distance.

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