1. Contribution of Mesopotamians in the field of science: The Mesopotamians made great progress in the field of science. They were expert in mathematics, medicines and astronomy, and were the first to develop algebra and geometry. They also used the figure of 60 for measuring time in hours, minutes and seconds. They were the first to divide a circle into 360° and the day and night into 12 hours each. They invented a calendar of 12 months with 30 days each. 

2. Mummification: The Egyptians believed in life after death. They believed that the body should be preserved so that the soul might live within it. They developed the art of preserving the body to great perfection — a process called mummification. The embalmed body (mummy) was placed in a coffin and put inside a pyramid. 

3. The Great Pyramid: The Great Pyramid at Giza near Cairo was the largest pyramid. It was built by Pharaoh Cheopa (Khufu) in 2650 BC. It is one of the seven wonders of the ancient world and it took over 20 years to be built. 

4. Great Wall of China: The Great Wall of China is a fine example of engineering skills of ancient Chinese. It is the highest and longest wall in the world. It extends over 2400 km and is eight meters high and seven meters wide. There are 16,000 towers across the length of the wall. Each tower is built at an interval of 150 meters and is 14 feet high. The Great Wall of China is one of the seven wonders of the ancient world.