Metalworking, glassmaking, textile weaving, food management, and water storage and irrigation were among the various technologies invented by the Mesopotamian people. They were also among the world's earliest Bronze Age people. Babylonians and Assyrians built many large buildings and statues made of bronze. These objects are found all over the world today. Mesopotamia is one of the two regions of Asia (the other being India) that developed an advanced culture with its own unique writing system, mathematics, science, medicine, technology, agriculture, city planning, architecture, and much more. The first civilizations in the region came about around 4500 B.C. with the Sumerians, who were followed by the Akkadians, Babylonians, Assyrians, and Persians. Science in Mesopotamia was not limited to scholars but also included priests and astrologers. They made observations about the universe and Earth's environment and used this data to explain things such as natural disasters. For example, they believed that disobeying the laws of gravity would result in falling stars and thus created myths about falling stars being gods thrown out of heaven or rebels against a supreme power. They also studied plants for medicinal purposes and discovered how to grow certain crops such as wheat and barley in irrigated fields.