The Hindu-Arabic numeral system
•Hindu mathematicians of the 300's and 200's BC used a system based on 10. The Hindus had symbols for each number from one to nine. They had a name for each power of 10, and used these names when writing numerals.
Astronomy

Sikhism
The founder of this faith was Guru Nanak, who from his childhood was attracted to both Hindu and Muslim saints. The Gurus who followed Nanak contributed to the consolidation and spread of Sikhism. The teachings of Guru Nanak were incorporated in the 'Guru Granth Sahib', the Holy Book of the Sikhs which became a symbol of God for Sikhs. The fifth Guru, Guru Arjun built the Golden Temple at Amritsar which became the holiest of Sikh shrines. The tenth Guru, Govind Singh imparted military training to the Sikhs to help them defend themselves.

Christianity
By tradition, Christianity is said to have arrived in India with Saint Thomas, one of the apostles of Jesus Christ, who spent some years in South India and possibly died there. However, others believe that the first missionary to arrive in the country was Saint Bartholomew. Much of the modern influences in the Indian society can be attributed to the role of Christianity in India. Christian missionaries helped in setting up schools and colleges all over India and also spread the message of faith and goodwill in the country.

Buddhism
Buddhism originated as an offshoot of Hinduism in India, but eventually it became popular all over Asia. The personality and teachings of Gautam Buddha, the founder of this faith, have illumined the lives of millions of people in Japan, China and Southeast Asia. Buddhism has many concepts akin to Hinduism like karma and reincarnation. Buddha suggested that life is full of sufferings and one must act in a way to escape from them.