The Kurgan people had to originate in Central Asia. - Bernard Sergen

The Vedda, the Melano-Indians and the Indus people and the actual inhabitants of the northern half of India, which classical anthropology used to class as Mediterraneans, all belong to one same human 'current' of which they manifest the successive 'waves'. Everything indicates, physical traits as well as geographical distribution, that the Vedda have arrived first, followed by the Melano-Indians, and then the Indus people."... "The Italian anthropologist [Mario Cappieri] has emphasized not only that the skulls of Mohenjo Daro resemble those of today's Sindh and those of Harappa resemble those of today's Panjab, but even that the individual variability is identical today to what it was four thousand years ago.

Shiva, Varuna, Yama, Durga-Parvati, we already said it, are deities of IE origin, the rituals concerning fire, soma and the person of the king are equally of IE if not Indo-Iranian origin. But it is now obvious that the Indo-Aryans, upon arriving in India, have amply harvested the Harappan heritage and included its ritual customs (construction of hearth-altars, rites inside buildings, use of the stellar vestment, ritual baths, fixation of feasts on the stellar equinoxes…) in their own religion.

One of the paradoxes of India is its astonishing linguistic diversity (they speak about five hundred languages there) compared with its cultural unity.