Do you know ants made a big city under the ground? Scientists poured hot metal into an old ant hole. After it became hard, they dug it out and saw something amazing. The ants had built roads, rooms, and even gardens! Later, the scientists used cement instead. They poured 10 tons of cement for 3 days. Then, they cleaned it for 10 more days. What they found was a huge ant city, bigger than two floors. More than 1 billion ants lived there! If ants can build something like this, what do you think th