<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. He is considered one of the greatest mathematicians of all time. He was born in a poor family and was not able to go to school, but he taught himself mathematics by reading and studying. He is most famous for his work in number theory, and he made important contributions to the study of infinite series. He died at the age of 32, when he was hit by a train.