What advances did Han scientists make?

Han scientists made significant advances in various fields, including astronomy, mathematics, and medicine. They developed the seismograph to detect earthquakes, created more accurate calendars, and improved the understanding of celestial movements. In medicine, they introduced acupuncture and herbal remedies, laying the groundwork for traditional Chinese medicine. Additionally, they made strides in Metallurgy, particularly in the production of iron and steel, which enhanced tools and weaponry.