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There are many notable contributors to the field of Chinese science throughout the ages. One of the best examples would be Shen Kuo (10311095), a polymath scientist and statesman who was the first to describe the magnetic-needle compass used for navigation, discovered the concept of true north, improved the design of the astronomical gnomon, armillary sphere, sight tube, and clepsydra, and described the use of drydocks to repair boats. After observing the natural process of the inundation of silt and the find of marine fossils in the Taihang Mountains (hundreds of miles from the Pacific Ocean), Shen Kuo devised a theory of land formation, or geomorphology. He also adopted a theory of gradual climate change in regions over time, after observing petrified bamboo found underground at Yan'an, Shaanxi province. If not for Shen Kuo's writing, the architectural works of Yu Hao would be little known, along with the inventor of movable type printing, Bi Sheng (990-1051). Shen's contemporary Su Song (10201101) was also a brilliant polymath, an astronomer who created a celestial atlas of star maps, wrote a pharmaceutical treatise with related subjects of botany, zoology, mineralogy, and metallurgy, and had erected a large astronomical clocktower in Kaifeng city in 1088. To operate the crowning armillary sphere, his clocktower featured an escapement mechanism and the world's oldest known use of an endless power-transmitting chain drive.

What did Shen Kuo study to discover climate change?
Answer: petrified bamboo
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The Mature Indus civilisation flourished from about 2600 to 1900 BCE, marking the beginning of urban civilisation on the subcontinent. The civilisation included urban centres such as Dholavira, Kalibangan, Ropar, Rakhigarhi, and Lothal in modern-day India, as well as Harappa, Ganeriwala, and Mohenjo-daro in modern-day Pakistan. The civilisation is noted for its cities built of brick, roadside drainage system, and multistoreyed houses and is thought to have had some kind of municipal organization.

When did the Mature Indus Civilization thrive?
Answer: 2600 to 1900 BCE
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The emergence of Susa as a city, as determined by radiocarbon dating, dates back to early 4,395 BC. There are dozens of prehistoric sites across the Iranian plateau, pointing to the existence of ancient cultures and urban settlements in the 4th millennium BC. During the Bronze Age, Iran was home to several civilizations including Elam, Jiroft, and Zayande River. Elam, the most prominent of these civilizations, developed in the southwest of Iran, alongside those in Mesopotamia. The emergence of writing in Elam was paralleled to Sumer, and the Elamite cuneiform was developed since the 3rd millennium BC.

What ancient city dates back as early as 4395 BC in Iran?
Answer:
Susa