Shannon O'Neil, Latin American studies fellow at the Council on Foreign Relations. answers questions posed by PBS about Mexico's President Felipe Calderon's visit to the United States. The Q & A covers a range of issues from...

Discusses several pioneers of heart surgery, including Christian Barnard.

Dive into the depths of an active volcano! This PBS site provides an inside look at Nyirgongo, an active volcano along the East African Rift. Take part in this interactive to find out more through vivid images and in depth information.

Explore what generates a jet stream, and discover why they flow from west to east. A link is offered in this site to a helpful animation describing the jet stream process.

Examine the features of Concorde that were designed and engineered for high-altitude, supersonic flight by exploring this detailed, interactive cross section.

Describe The Periodic Table of Elements, identify the elements that make a firework work and examine the contribution of each element to the total fireworks effect.

The companion site for independent filmmaker Jessica Yu's exploration of the life and work of Henry Darger, which originally aired on PBS's "P.O.V." series in 2005. Along with a synopsis of the film and Yu's insights about her subject,...

NOVA presents a slide show of orchids with brief descriptions of each of the 15 pictures. See the beauty of each orchid, who it was named for and where it lives.

Explore the world of Africa through these teacher's guides. This site features teacher tools for middle school age students.

Story of Srebrenica, Bosnia, the world's first United Nations Safe Area, the site of the worst case of genocide in Europe since World War II.

PBS features a summary of the landmark Supreme Court case of Barron v. Baltimore which stated that the freedoms guaranteed by the Bill of Rights did not restrict the state governments. Decision written by Chief Justice John Marshall.

PBS features a summary of the landmark Supreme Court case of Gibbons v. Ogden which dealt with congressional powers through the Commerce Clause of Article I, Section 8. Decision written by Chief Justice John Marshall.

PBS features a summary of the landmark Supreme Court case of Dred Scott v. Sanford which ruled that African Americans are not American citizens, and therefore could not sue in federal court. Decision written by Chief Justice Roger B. Taney.

How much do you think you know about trees? PBS site offers a video and description of the life cycle of trees and their leaves.

Can exercise really help our brain work better? This PBS site discovers if this is really true by taking you into the worlds of Jada and Maurna to find out.

PBS offers an experiment that kids can do at home to learn more about heat conduction and how it works.

This PBS Kids site teaches students about crystals and includes an activity that shows how to make sparkling gems at home.

How do leaves breathe? PBS site explores how plants breathe and sustain life.

How can you cut a rock without a saw? Is it possible? PBS site invites you to come along with Mike and Victor to find out.

This PBS kids site features dozens of short plays that have been performed on the children's television series "Zoom." Includes short scripts for skits which students can perform together, and lists of props to include in the performance.

See how much public education has changed from the one-room schoolhouse days of the frontier. From a companion essay to the PBS series, Frontier House.

Would you clean your plate if you had to eat what frontier families served in eastern Montana? Find out what's on the menu from this companion essay to the PBS series, Frontier House.

Making a house a home was a struggle on the plains. This companion essay to the PBS series, Frontier House, describes the problems with getting water, outhouses, and furnishing the sod house.

A close up picture providing an example of what a slave chain looks like. Click on Teacher's Guide for teacher resources.