1.Fibonacci Numbers
The Fibonacci numbers were first described by Virahanka, Gopala and Hemachandracharya as an outgrowth of earlier writings by Pingala.
2.Decimal System, Quadratic formula and Zero!
It was in 7th century CE when Brahmagupta found the first general formula for solving quadratic equations. The decimal system (or the Hindu number system), which was a precursor of the Arabic numeric system, was developed in India between the 1st and 6th centuries CE.
3.Cataract Surgery
Indian physician Sushruta (6th century BCE) had the knowledge of performing cataract surgery. It spread to China from India. Greek scientists would visit India to get operations done and also to learn the nitty-gritties.
4.Cotton cultivation (We clothed the world, yay!)
The ancient Greeks used to wear animal skins and were not even aware of cotton. But Indians were sort of cool 
and started cultivating cotton during the 5th – 4th millennium BCE in the Indus Valley Civilization. The word spread to the Mediterranean and beyond .
and started cultivating cotton during the 5th – 4th millennium BCE in the Indus Valley Civilization. The word spread to the Mediterranean and beyond .
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