Diamonds, rubies, emeralds, and sapphires are most of the classic gemstones adorning royal jewels. But they used to be accompanied by a stone that nowadays is most often found in museum gift shops: Amethyst. Here's the story of...

Live-action video footage helps students understand the characteristics of solids. Special attention is given to the properties of crystalline solids and amorphous solids. The video correlates to the Next Generation Science Standard for...