This video segment from Evolution: "Extinction!" shows the impact of invasive species on native ecosystems.

This ZOOM video segment shows how to create a self-contained environment and explores evaporation, condensation, and precipitation.

The purpose of this resource is to quantitatively evaluate the accuracy of a classification system. Students sort birds into three possible classes based on each bird's beak: carnivores, herbivores, and omnivores. Students compare their answers with a given set of validation data.

There are almost as many types of bird beaks as there are types of food that birds like to eat. This collection of images shows a wide range of beaks and the types of foods handled by each.

In this Nature video, learn about the extraordinary impact that birds have on the agriculture of a small Indian community.

In this video segment, adapted from NOVA, Dr. Judah Folkman uses the scientific method to discover how cancer cells induce the formation of new blood vessels, which in turn nourish those cancer cells.

In this video, Jonathan joins Charlie Donilon on his shark charter boat in Rhode Island, Massachusetts, and learns about how shark tagging has shed light on the biology of and behavior of Blue sharks. Tagging has shown that these incredible swimmers actually migrate completely across the Atlantic ocean. Jonathan tries his hand at tagging a shark and then swims with Blue sharks. We also learn that Blue sharks are not nearly as vicious as they have been reputed to be, and the divers are actually able to pet the sharks! Please see the accompanying study guide for educational objectives and discussion points.

Throughout the day, your nervous system monitors and makes endless adjustments to your body's basic systems -- all to keep you alive. This interactive feature illustrates the complexity of such a task.

This list of botanical gardens and arboretums includes links to Web sites which you can search for institutions in your region. In addition, it includes detailed information about 14 of the country's largest botanical gardens and arboretums. Where possible, it includes the following information for each: mailing address and phone number, Web site and email address, details about its grounds and collections, and the type of support offered, including educational materials, resource libraries, and classes/workshops.

Find out how serious head concussions can be in this video segment adapted from NOVA scienceNOW.

This video segment from The Human Spark observes the brains responses to a series of cognitive tests.

In this video segment adapted from A Science Odyssey, learn about bubonic plague and how city officials in San Francisco tried to contain its spread in the early 1900s..

In this interactive activity from Shedd Aquarium, build a fish and then release it into the reef to search for food and evade predators. Try different combinations and observe how each kind of fish has unique adaptations that help it survive in its habitat.

In this activity, learners burn a peanut, which produces a flame that can be used to boil away water and count the calories contained in the peanut. Learners use a formula to calculate the calories in a peanut and then differentiate between food calories and physicist calories as well as calories and joules.

This is an assessment activity for the The Cosmic Ray Telescope for the Effects of Radiation (CRaTER) educational kit. Learners will make a poster that explains possible origins of cosmic rays, how they affect people, and what protects us here on Earth. Alternately, they will make a poster describing CRaTER’s goal and how it works.

In this Biodiversity Counts activity, students learn how scientists calculate a biodiversity index using a page from the phone book as their data source. The printable five-page PDF handout includes a series of inquiry-based questions to get students thinking about what they already know about biodiversity and how living and non-living things are connected, step-by-step directions for calculating a biodiversity index, and a worksheet that includes brainstorming questions and areas for recording answers.

In this video segment adapted from NOVA scienceNOW, scientists discuss a family of genes called FOXO that can significantly extend life span in worms—and in humans.

In this video segment from NatureScene, explore Cartwheel Bay, a wetland in South Carolina, and learn about the variety of carnivorous plants native to this unique landform.

In this video adapted from Texas Parks and Wildlife Department, learn about carnivorous plants that act as both producers and consumers in an ecosystem. See sundews and blatterworts capture and digest insects.

This interactive feature describes some of the most important structures and functions of the cell membrane.