Ancient Maps

The history of science and technology in India dates back to ancient times. The Indus Valley civilization yields evidence of hydrography, metrology and sewage collection and disposal being practiced by its inhabitants. Among the fields of science and technology pursued in India were Ayurveda, metallurgy, astronomy and mathematics. Some ancient inventions include plastic surgery, cataract surgery, Hindu-Arabic numeral system and Wootz steel.
The history of science and technology in China show significant advances in science, technology, mathematics, and astronomy. The first recorded observations of comets and supernovae were made in China. Traditional Chinese medicine, acupuncture and herbal medicine were also practiced.
Ancient Greek technology developed at an unprecedented speed during the 5th century BC, continuing up to and including the Roman period, and beyond. Inventions that are credited to the ancient Greeks such as the gear, screw, bronze casting techniques, water clock, water organ, torsion catapult and the use of steam to operate some experimental machines and toys. Many of these inventions occurred late in the Greek period, often inspired by the need to improve weapons and tactics in war. Roman technology is the engineering practice which supported Roman civilization and made the expansion of Roman commerce and Roman military possible over nearly a thousand years. The Roman Empire had the most advanced set of technology of their time, some of which may have been lost during the turbulent eras of Late Antiquity and the Early Middle Ages. Roman technological feats of many different areas, like civil engineering, construction materials, transport technology, and some inventions such as the mechanical reaper went unmatched until the 19th century.
Qanats which likely emerged on the Iranian plateau and possibly also in the Arabian peninsula sometime in the early 1st millennium BC spread from there slowly west- and eastward.