The thing that I found the most cool was the earthquake detector. It was very interesting that the earthquake detector’s head, the dragon, would drop a ball from its mouth into the frog’s mouth. It was also interesting to see a cup called ‘fair cup,’ which had a secret hole inside the cup. Water goes through the hidden hole that is under the ‘fair cup.’ I want to look at more informations for ancient Greece, Rome and Egypt, which I’m working on. But I wonder, how did the Ancient Chinese invent these four great inventions?

Sincerely,
Diana