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Lokalalei 2C archaeological site yielded almost 3,000 archaeological finds. some 60 sets of complementary matching stone artefacts were reconstituted. The refits, predated the Koobil Fora refits by 500 Kyr, and are the oldest ever studied. The core reduction sequences are analyzed, based on the refits, enabling accuracy in the understanding of flake production processes. A greater cognitive capacity and motor skill for early hominids is thus demonstrated.

Evidence exists of a link between the hominid group Paranthropus and stone tool manufacture between around 2.5 and 1.5 million years ago. There is data showing that Paranthropus aethiopicus/boisei existed in Ethiopia's Omo region during the same approximate time period. These relate to new evidence from Gona in Ethiopia, which reveals that the onset of tool manufacture dates back to 2.5 million years ago and a recent report that stone tools were discovered in 'close association' with a jawbone from an early example of the Homo species at a nearby 2.3 million-year-old site in Hadar.

Evidence has been gathered that certain stone artifacts produced during the Middle Palaeolithic period had handles or hafts. This technique has been used in more recent periods to manufacture more complex tools such as cutting tools. A study is presented to show the presence of bitumen on two stone artefacts during the abovementioned period extracted from the site of Umm el Tlel in Syria.

Analysis of a replica of an ivory boomerang of the prehistoric age suggests that it is a straight-flying tool, weighing 800 grams with a broad handle and camp and can be used with the right or left hand without affecting flight qualities. The replica travels up to 66 m and its flight is more affected by an opposing wind than by an imposing wind. The flight path remains uniform in various climates.