Mr. Nelson Kiprono Rotich as a co-author amongst the 31 other international researchers did a publication (on Feb. 9, 2023) entitled “Expanded geographic distribution and dietary strategies of the earliest Oldowan hominins and Paranthropus”, in the journal Science with an Impact Factor of 63.714 (www.science.org/doi/10.1126/science.abo7452). The study presents what is likely to be the oldest examples of a hugely important stone-age innovation known to scientists as the Oldowan toolkit, as well as the oldest evidence of hominins consuming very large animals. Though multiple lines of evidence suggest the artifacts are likely to be about 2.9 million years old, the artifacts can be more conservatively dated to between 2.6 and 3 million years old. Along the shores of Africa’s Lake Victoria in Kenya roughly 2.9 million years ago, early human ancestors used some of the oldest stone tools ever found to butcher hippos and pound plant material. Excavations at the site, named Nyayanga and located on the Homa Peninsula in western Kenya, also produced a pair of massive molars belonging to the human species’ close evolutionary relative Paranthropus. The teeth are the oldest fossilized Paranthropus remains yet found, and their presence at a site loaded with stone tools raises intriguing questions about which human ancestor made those tools. Mr. Kiprono was active in the analytical part of the research which was a continuation of previously done X-ray Fluorescence analysis on the Museum samples.