The food pyramid depicts the five major food groups: grains, fruit, vegetables, milk, meat and beans.

Play with objects on a teeter totter to learn about balance. Test what you've learned by trying the Balance Challenge game.

This webpage from Exploratorium provides an activity that demonstrates the Bernoulli principle with readily available materials. In this activity a table tennis ball is levitated in a stream of air from a vacuum cleaner. The site provides an explanation of what happens, asks questions about the activity, and also describes applications to flight. This activity is part of Exploratorium's Science Snacks series.

This three-act math task utilizes videos and questioning to help students explore number combinations.

In this quick and simple activity, learners explore how the distribution of the mass of an object determines the position of its center of gravity, its angular momentum, and your ability to balance it. Learners discover it is easier to balance a wooden dowel on the tip of their fingers when a lump of clay is near the top of the stick. Use this activity to introduce learners to rotational inertia.

Learn about the checks and balances system of the three branches of the U.S. government.

See Bald Eagles up close in this amazing tour around the United States.

Students will take inspiration from the choreographer Charles Moulton and his community based ball passing choreography. Students will learn basic ball passing movements and rhythms and create their own way of ball passing with their friends.

Scientists unravel the mysteries and misconceptions surrounding precious gemstones. Learn about the chemistry, physics, and geology of gems and crystals. Recorded in the Hall of Geology, Gems, and Minerals at the Smithsonian National Museum of Natural History.

Africa's dynamic culture has always been fueled by the movement of people, things, and ideas. Africans use cultural traditions as a starting point for new innovations. In friendship, conversation, daily life, and university classrooms, African artists learn traditional techniques and develop the latest ideas.

From the Field Museum in Chicago, IL, this electronic field trip takes you through five million years of human evolution so you can picture our beginnings and imagine our future. During the program you will experience seven fossil stations that highlight a different human ancestor at a particular moment in time.

Every day, thousands of cargo ships around the world are busy loading and unloading their cargo. In addition to their intended cargo, however, these enormous vessels also ship other, unintended cargo. Hidden in the ships' ballast water - water used to stabilize the ships when not carrying a load - and stuck to the ships' hulls, millions of tiny plants and animals are also making their way around the world. These non-native organisms are released with ballast water into a new port during loading and unloading of cargo or are scraped off the hull. Though not all survive the big trip, some do, and even adapt well to the environment. Some do so well that they out-compete local species, and others introduce diseases that quickly spread through the ecosystem.

For two days, the Nation's Capitol will be turned into one of the largest classrooms in the country. Join Members of Congress, lobbyists, government officials, and your fellow students as we explore a national issue, discover the legislative process, and maneuver the forces that shape national policy.

For two days, the Nation's Capitol will be turned into one of the largest classrooms in the country. Join Members of Congress, lobbyists, government officials, and your fellow students as we explore a national issue, discover the legislative process, and maneuver the forces that shape national policy.

This electronic field trip will convene in February 2004 at the grassroots level. Students in classrooms across the country will research the issue, solicit feedback from constituents, and define their position.

Join the Smithsonian's National Air and Space Museum for an anniversary like no other. Celebrate the occasion by visiting the Museum's new exhibition: The Wright Brothers & The Invention of the Aerial Age.

Join the Smithsonian's National Air and Space Museum for an anniversary like no other. Celebrate the occasion by visiting the Museum's new exhibition: The Wright Brothers & The Invention of the Aerial Age.

Many Americans are surprised to learn that women once played professional baseball in the All-American Girls Professional Baseball League (AAGPBL) from 1943-1954. Founded by Chicago Cubs owner Phil Wrigley in order to entertain Americans - and keep ballparks full - during World War II, the league provided unprecedented opportunity for young women to play professional baseball, see the country, and aspire to careers beyond the traditional roles of teacher, secretary, nurse, librarian, or housewife.

Take a front row seat on the wooden bleachers of a wind-swept-field where baseball provides a virtual view of our country's character. Journey back in time to discover a young land as its enterprising soul comes of age in the villages and towns of 19th century America. Follow the exploration of a western frontier after an anguishing Civil War to see how natives and naturalized citizens forge a familiar pastime while learning each other's customs and cultures.

Awaiting you discovery is the fascinating world of active volcanism, biological diversity, and a legacy of Hawaiian culture at Hawai'i Volcanoes National Park. Here, your students will get to see lava up close and learn of it's impact and eruption into the sky!

Presidential campaigns are different now. People no longer come to the candidate's home. Instead, the candidate comes to the homes of the people; his picture and message are beamed into millions of bedrooms and kitchens. The notepad and pencil are gone, replaced by computers and phone lines, video cameras, and satellites. The most important thing has not changed. This year, as every four years from the beginning of the republic, candidate and press will be joined - often suspiciously, sometimes in hostility - but always from the necessity as essential partners in the quadrennial dance of democracy.