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.

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.

This video segment presents a variety of sounds -- from animals to machines to musical instruments -- while introducing the basic concepts of vibration, volume, and pitch.

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

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.

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.

In this ZOOM video segment, cast member Francesco follows the paper trail to find out what happens to his recyclables. He visits a material recovery center and learns how paper is recycled and the number of trees that are saved as a result.

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

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

In this video segment from Cyberchase, Bianca goes on a quest to find out if a coin toss really is a 50-50 proposition.

In this video segment from Religion and Ethics Newsweekly, Imam Bashar Arafat, a scholar and interfaith leader in Baltimore, Maryland, describes __Œ‹í‹__zakaat,__Œ‹í‹Œ‹Ű_ an almsgiving tax that Muslims pay annually.