1.4-Million-Year-Old Ax Made of Hippo Bone Found in Ethiopia | Smart News | Smithsonian Magazine
https://www.smithsonianmag.com/smart-news/14-million-year-old-hippo-bone-hand-axe-found-ethiopia-180975314/
A Neanderthal Odyssey: Everything We Know about the Neanderthals - YouTube
https://www.youtube.com/watch?v=NNVA6tl4Im4
Baffling 400,000-Year-Old Clue to Human Origins - The New York Times
https://www.nytimes.com/2013/12/05/science/at-400000-years-oldest-human-dna-yet-found-raises-new-mysteries.html
Decoding the Earliest Symbols | Articles | Inference: International Review of Science
https://inference-review.com/article/decoding-the-earliest-symbols
Early expansions of hominins out of Africa - Wikipedia
https://en.wikipedia.org/wiki/Early_expansions_of_hominins_out_of_Africa
Homo erectus study reveals 4 new facts about this ancient human
https://www.inverse.com/science/homo-erectus-lifestyle-discovery-skull-tools
Homo erectus, not humans, may have invented the barbed bone point | Science News
https://www.sciencenews.org/article/homo-erectus-not-humans-invented-barbed-bone-point-tool
How Did We Get to Be Human? - The New York Times
https://www.nytimes.com/2018/11/19/science/human-evolution-hominins.html
This 1.4-million-year-old hand ax adds to Homo erectus’ known toolkit | Science News
https://www.sciencenews.org/article/homo-erectus-hand-ax-stone-age-tools
Toe Fossil Provides Complete Neanderthal Genome - The New York Times
https://www.nytimes.com/2013/12/19/science/toe-fossil-provides-complete-neanderthal-genome.html
We probably don’t descend from Australopithecus sediba | Ars Technica
https://arstechnica.com/science/2019/05/probability-helps-narrow-down-the-search-for-human-ancestors/