Listen as Stephen Hawking, aided by 3-D animation, explains the concept of space-time and how black holes are formed.

Heat refers to quantity of hotness, and is determined by the mass and speed of molecules. This program demonstrates that a bucket of water at a temperature of 50?C contains more heat than a cup of water at 100?C.

The song performed by Tom Lehrer, about all the elements in the periodic table. Animated By Yoshi Egg Films.

A reading of Poe's famous poem by Christopher Walken.

Poe's famous poem as performed by 18 teen performers.

An explosion in green building is underway, with cleverly engineered libraries, office buildings, even public housing projects popping up across the Bay Area, and championed as much by landlords trying to cut energy and water costs as by environmental groups.

This is a school project presented by a 4th grade middle-school pupil. It's intended to enhence pupils speaking skills.

Made by a class of 3rd grade ELL students using Microsoft PhotoStory 3. They drew a picture of what the meaning of the idiom sounds like. Then they drew a picture showing the real meaning of the idiom.

Student's Rap about Schoolwide Positive Behavior Support. Provided by Oakdale Primary School in Tuscaloosa, Alabama.

A few great quotes by great men and women.