[10][11] It also relies on the extensive study titled "The Genomic Formation of Central and South Asia", co-authored by 92 scientists from around the world and co-directed by geneticist David Reich of Harvard Medical School, in which ancient DNA was used.

[18][19] It posits that the Harappans were a mixture of Zagros agriculturists (from the modern-day Iran area) and First Indians,[20] a wave of migrants who came from Africa into Arabia and then reached India around 65,000 years ago.

[27][28] It mentions that "Aryan" culture was most likely the result of interaction, adoption, and adaptation among those who brought Indo-European languages to India and those who were already well-settled inhabitants of the region, and that Sanskrit and the Vedas developed in the Indian subcontinent.

[34] Swaminathan Aiyar of The Times of India thought that the book helps us understand how all Indians have African, Harappan, and Steppe Asian genes in different doses.

[35] Author Gurcharan Das said that the book helps us understand that Indians are composed of a large number of small populations.