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Mathematics
When something is easy, you say: "It's as easy as 1,2,3..."
The figures 1,2,3,4,5,6,7,8,9 are so easy to use today, but they have had a painful growth through many centuries. The earliest forms of these figures originated in India. Inscriptions with these figures have been found in several ancient Indian sites.
The magical zero "0" also originated in ancient India. It enabled men to write any figure, no matter how large, by using just ten symbols - 0,1,2,3,4,5,6,7,8,9.
India contributed to the development of trigonometry also. An early Indian mathematician by the name of Aryabhata (500 AD) calculated the values of the sines of angles, and wrote a book called the Aryabhatyam where the values are given in verse.