Building the Channel Tunnel

How do you build a tunnel 32 miles long -- under water? This video segment adapted from Building Big, follows the construction of the Channel Tunnel (nicknamed "Chunnel"), the engineering wonder that connects England to France.

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Collecting Data Below the Earth's Surface

This video segment adapted from Discovering Women demonstrates how scientists use sound waves to collect data about the structure of Earth's crust.

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Geospatial Revolution

Learn how satellite imagery, social networking sites, mapping technologies, and volunteers worked together to address human needs following an earthquake in Haiti, in this video segment from Geospatial Revolution, produced by Penn State Public Broadcasting.

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Hurricanes: New Orleans Under Threat

This video segment adapted from NOVA scienceNOW exposes how decades of development and geography combined to make the potential damage from a hurricane uniquely devastating in New Orleans, Louisiana.

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The Leaning Tower: Where It Stands Today

Will the Leaning Tower of Pisa give way to gravity? In this interview from the NOVA Web site, engineer John Burland relates the difficult job of saving the tower.

Meet Curiosity, a Mars Rover

Learn about the sophisticated scientific instruments on Curiosity, the latest Mars rover, in this interactive activity adapted from NASA.

The Mississippi River Delta

These images from NASA, the Lunar and Planetary Institute, and U.S. Geological Survey illustrate the effects of severe storms and decades of river management on the size and shape of the Louisiana coastline and the Mississippi River Delta.

Visualizing Topography

Explore the topography of a hill, a valley, and a cliff in this interactive activity featuring visualizations of three-dimensional topography in two dimensions. Adapted from Stephen Reynolds' "Visualizing Topography."