The Oldowan, often spelled Olduwan or Oldawan, is the archaeological term used to refer to the stone tool industry that was used by Hominines during the Lower Paleolithic period. The Oldowan is significant for being the earliest stone tool industry in prehistory, being used from 2.6 million years ago up until 1.7 million years ago, when it was followed by the more sophisticated Acheulean industry. Oldowan tools were therefore the earliest stone tools in human history, and mark the beginning of the archaeological record of stone tools. The term "Oldowan" is taken from the site of Olduvai Gorge in Tanzania, where the first Oldowan tools were discovered by the archaeologist Louis Leakey in the 1930s. However, some contemporary archaeologists and palaeoanthropologists prefer to use the term "Mode One" tools to designate Oldowan tools, with "Mode Two" designated Acheulean ones and so forth.

It is not known for sure which hominin species actually created and used Oldowan tools. Its emergence is often associated with the species Australopithecus garhi, and its flourishing with early species of Homo such as H. habilis and H. ergaster. Early Homo erectus appears to inherit Oldowan technology and refines it into the Acheulean industry beginning 1.7 million years ago. Oldowan tools are sometimes called "pebble tools," so named because the blanks chosen for their production already resemble, in pebble form, the final product. Oldowan tools are sometimes subdivided into types, such as chopper, scrapers and pounders, as these appear to have been their main uses.

Mary Leakey (6 February 1913 – 9 December 1996) was a British archaeologist and anthropologist, who discovered the first fossilized Proconsul skull, an extinct ape now believed to be ancestral to humans, and also discovered the robust Zinjanthropus skull at Olduvai Gorge. For much of her career she worked together with her husband, Louis Leakey, in Olduvai Gorge, uncovering the tools and fossils of ancient hominines. She developed a system for classifying the stone tools found at Olduvai. She also discovered the Laetoli footprints. In 1960 she became director of excavation at Olduvai and subsequently took it over, building her own staff. After the death of her husband she became a leading palaeoanthropologist, helping to establish the Leakey tradition by training her son, Richard, in the field.

Mary Leakey was born Mary Douglas Nicol on 6 February 1913 in London, England to Erskine Edward Nicol and Cecilia Marion (Frere) Nicol. Since Erskine worked as a painter, specializing in watercolor landscapes, the Nicol family would move from place to place, visiting numerous locations in the USA, Italy, and Egypt, where Erskine painted scenes to be sold in England. Erskine Nicol developed an amateur enthusiasm for Egyptology during his travels. Mary Leakey was a direct descendant of antiquarian, John Frere, and cousin to archaeologist, Sheppard Frere, on her mother's side. The Frere family had been active abolitionists in the British colonial empire during the nineteenth century and established several communities for freed slaves. Three of these communities remained in existence as of Mrs. Leakey's 1984 autobiography: Freretown, Kenya, Freretown, South Africa, and Freretown, India. She also was a distant relative of baronet Henry Bartle Frere.

Bloody Knife (Sioux:Tamena Way Way or Tamina WeWe; Arikara:Nes I Ri Pat or Nee si Ra Pat; ca. 1840 – June 25, 1876) was an American Indian who served as a scout and guide for the U.S. 7th Cavalry Regiment. He was the favorite scout of Lieutenant Colonel George Armstrong Custer and has been called "perhaps the most famous Native American scout to serve the U.S. Army."

Bloody Knife was born to a Hunkpapa Sioux father and an Arikara mother around 1840. He was abused and discriminated against by the other Sioux in his village because of his mixed race background, in particular by Gall, a future chief. When Bloody Knife was a teenager, he left his village with his mother to live with the Arikara tribe. His brothers were killed during a Sioux raid led by Gall in 1862. Bloody knife found employment as a courier and hunter for the American Fur Company and later served under Alfred Sully before scouting for George Custer on several military expeditions. He died from a bullet wound to the head on June 25, 1876 during the Battle of the Little Bighorn.