"Fighting Over A Gem"
                            -Who Wins it?

Once upon a time, two powerful dragons thought they could control anything they wanted. One day, they picked up a colorful round stone on a rock formation. Immediately they found the stone rotated clockwise. They wanted to stop its rotation. They tried to hold it tight, but the stone kept moving.

The animation below shows the two dragons in action. How do you know they were working very hard?

A young dragon hiding underground heard noises coming from the rocks. He could not wait to see what's going on outside. Suddenly he pierced the rocks and spotted a colorful stone immediately. He instinctively knew that the stone was a valuable gem. Excited, he decided to seize it. So his tail pulled out his magical tool right away. He used it to check the stone again and again. In a minute the beautiful gem slipped away from two powerful old dragons.

Watch the animation. How did the magical tool prove that the stone was a beautiful gem? Did the smart young dragon seize the gem? How did he capture it?

(Note: This animation will keep looping.)