Rai Bahadur Daya Ram Sahni (1879-1939) was a pivotal figure in the discovery of Harappa, familiar with the mysterious seals and earlier archaeologist and scholar's visits to the site. It was Sahni who, after a three-day visit in February 1917 began the process that led to his first excavations there in January 1921.
"In the year 2000," writes the author, "I initiated a large‐scale effort to identify the geologic sources from which peoples of the Indus Civilization (ca. 2600 to 1900 BC) acquired rock and mineral resources."
"The discovery of the rotational capabilities of the wheel was one of the most significant human inventions, and wheel-enhanced rotation is now pervasive in the tools and machines that we use in our everyday lives. Importantly, the wheel was a major contributor to a range of developments in craft production technology, perhaps most visibly in the various forms of potter’s rotational devices and wheels."
Another example of how modern data science and the re-analysis of data collected by early archaeologists are opening new frontiers of discovery. In this case, finds made in one area of Mohenjo-daro, excavated by K.N. Dikshit, are being tabulated and located precisely in relation to other objects and the strata or level they were found at.

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