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Thought for the day!
Madhava (c. 1360-1420), an Empranitiri Brahman living in India, created methods to compute accurate values for trigonometric functions by generating infinite series.  His publications in Sanskrit date to approximately 200 years before Maclaurin, Gregory, Wallis, et al.  Here is a literal translation of his verse:

Multiply the diameter (of the circle) by 4 and divide by 1.  Then apply to this separately with negative and positive signs alternately the product of the diameter and 4 divided by the odd numbers 3, 5, and so on ...The result is the accurate circumference; it is extremely accurate if the division is carried out many times.
This expression is equivalent to the infinite series we usually attribute to Leibniz.