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.

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

This video from Religion & Ethics Newsweekly features Timbuktu, one of the most remote and inaccessible places on the planet and a former thriving center of Islamic learning.

This TV 411 segment features a lesson from Question Man on how to informally calculate 15% tips at restaurants.

In this video segment from Cyberchase, the CyberSquad tries to reach Ms. Fileshare by using a 3 x 3 matrix to figure out the various ways they can travel to her.

This video segment from Regents Review 2.0 uses a trigonometry equation to determine the height of a flagpole located in front of the school.

In this video segment from Cyberchase, Digit must a make a straight line between the two points and then follow the path created.

Jackie and Matt are looking at the same object along two different lines, in this video segment from Cyberchase.

In this video segment from Cyberchase, Harry must adjust his dinner budget after his cousin, Harry, unexpectedly decides to join him on his date

A variety of symbiotic relationships exist between sharks and other marine species in this segment from Nature.

Using manipulatives, students figure out patterns in problems involving seating arrangements. They write algebraic equations to describe the relationships.

The CyberSquad searches for HackerŒë_í_Œ_ castle based on a survey of where town residents have last seen him in this video from Cyberchase.

Students are introduced to algebraic expressions that use more than one variable and have multiple solutions. They figure out combinations of two items at different costs, with each combination adding up to 100.

In this Cyberchase video segment, the CyberSquad must locate each other using a map's grid to construct a coordinate system using letters and numbers.

Learn about different traits and adaptations in various species of hummingbirds in this video from Nature.

Ever wonder how a battery works? This segment highlights voltaic cells, their various components and how they operate.

In this video segment from TV411, WNBA player Olympia Scott Richardson discusses her techniques for effective time management.

In this video from Nature, learn about the erosive action of water on the Hawaiian landscape and human efforts to limit it.

In this Cyberchase video segment, Harry tries to snowboard and learns how to measure and identify many common angles.