Ever heard of rocks exploding in a campfire? Can it really happen, and how dangerous is it? What happens if you spill molten metal on concrete? Today we will look at how and why concrete and rocks spall during a fire.

This video is a lesson for students on using abstract nouns in their writing. The teacher explains the difference between abstract and concrete nouns and provides examples. The students are then given practice identifying abstract nouns...

In this video we give a detailed breakdown of Limestone and what the different uses of Limestone are.

Fossils are windows to the past. This fascinating program takes a look at how fossils are formed and preserved. Special attention is given to the meaning, significance, and use of fossils in telling us about past life on Earth.

The science that makes ice slippery also makes the Olympic Winter Games possible. But exactly what makes ice slippery? Ken Golden, a mathematician at the University of Utah, explains how the unique surface of ice makes the slide and...

We all know that the universe is big. But how big it is? Much bigger than you think. Let's start out by looking at the Earth, and then zoom out to progressively larger and larger structures, so that we can see just how big it is. Then...

In this video, the teacher explains the importance of using precise words and phrases in writing to create vivid mental images for readers. The teacher guides students through examples and practice exercises to help them understand the...

Not only are our cities and almost every product we use derived from the ground, so is almost all our energy. Yet minerals and petroleum products are only the start. Every culture has wondered

about the origin and nature of the...

In this video, the teacher explains how to organize and order evidence for an argumentative essay using boxes and bullets. The steps for writing an essay are reviewed, emphasizing the importance of planning and organization to build a...