<human>:  Who was the man who knew infinity?
<bot>: That would be Srinivasa Ramanujan, a mathematician who lived in India in the early 20th century. Ramanujan was a self-taught mathematician, who made contributions to number theory, analytic geometry, and other fields. He was also a prolific writer, and he wrote a series of notebooks that were discovered in the late 20th century. These notebooks are now considered to be some of the most important documents in the history of mathematics.