I learned about a lot of things such as Paleolithic period, Neolithic period, Bronze age, and the three kingdoms period. I remember the bronze age the most, so I will write about bronze age. Bronze age is when people started using tools made out of bronze. But many people couldn't have bronze tools because they were hard to find and expensive. So, items such as bronze sword, mirror, and bells were used at religious ceremonies. Also, bronze was not hard enough to use as tools for agriculture or weapons. And in Bronze Age, the people built stone tombs called Dolmens. These were made to show the wealth of the dead person. To make a Dolmen, you need to dig a hole and put two stones in the holes. And you need to get a capstone and put it on top of the stones. I wonder how they got it up there. Even if they used wheels, it would be very hard to pull because of the weight. I think the bronze age people were stupid. Why couldn't they think of machines in that time? If they did, Korea might be a lot more prosperous than now.