In this video adapted from Earth Island Institute, meet a high school student who educated her community about how a coal-burning power plant was contributing to asthma and other health problems there.

Why do teenagers act the way they do? This video segment from FRONTLINE: Inside the Teenage Brain explores the work scientists are doing to explain some of the mysteries of teenage behavior.

In this video adapted from Earth Island Institute's New Leaders Initiative, meet a high school student who worked to enact a state law to make cosmetics safer, after she learned they contained toxic chemicals linked to cancer.

Watch the ZOOM cast discover which insulator -- newspaper or aluminum foil -- is better at keeping an ice cube frozen longer.

In this video segment adapted from ZOOM, cast members show you how to make your very own electroscope. You can use it to find out if an object is electrically charged.

In this video segment from Cyberchase, learn about the importance of creating a model as the CyberSquad designs a giant Trojan Ducky that will help them enter a fort without being noticed.

This illustration from Evolution by Monroe W. Strickberger shows the remarkable similarities between the bones in the forelimbs of various tetrapods, all of whose limbs serve very different functions.

Take a behind-the-scenes tour of the Southeastern Theatre Conference (SETC) Design Competition and learn about the skills required for a career in costume design.

Take a behind-the-scenes tour of the Southeastern Theatre Conference (SETC) Design Competition and learn about the skills required for a career in lighting design.

Take a behind-the-scenes tour of the Southeastern Theatre Conference (SETC) Design Competition and learn about the skills required for a career in projection design.

Learn what it takes to be a scenic designer at the Southeastern Theatre Conference (SETC) Design Competition. Get advice and learn about the skills required for a career in scenic design.

Learn about sound design from theater majors participating in the Southeastern Theatre Conference (SETC) Design Competition. Get advice and learn about the skills required for a career in sound design.

This interactive activity from the NOVA Web site challenges you to think like Einstein and understand how time travel might be possible.

Examine how the human/grizzly relationship has changed since the closing of the Yellowstone dumps, and also learn about the challenges posed to both humans and bears, in this video segment from Nature.

Brendan Monroe doesn't follow strict guidelines, especially when it comes to his artwork. He makes rough sketches of his ideas and improvises along the way, making sure to keep the blurriness of the concepts and the mystery. His aim is to encourage people to see living things in everything in their environment.

Nigel Poor is a photographer who spends time documenting everyday existence, exploring the meaning of the traces of ourselves that we leave behind. She focuses on ordinary objects and materials, researching what makes an object “worthy of preservation,” in her words. This KQED Art School video was created in collaboration with SFMOMA, who commissioned art-making activity ideas from Nigel Poor for their Open Studio project.

This video from NASA explains the process by which gamma-ray flashes associated with storms produce matter/antimatter particle pairs.

This illustrated essay from the NOVA Web site answers questions about irregularities in the tides.

In this lesson designed to enhance literacy skills, students learn that transitional fossils provide scientists with evidence to establish how major animal groups are related to one another.