Archaeologists in China Discover the Oldest Stone Tools Outside Africa - The New York Times
Using microartifacts to infer Middle Pleistocene lifeways at Schöningen, Germany
Outline of prehistoric technology - Wikipedia
Ancient tools found in China are 2MILLION years old – revealing early history of humans leaving Africa was WRONG by 270,000 years
What species of early humans might have been responsible for making the large hand axes? - Quora
Early humans migrated out of Africa even earlier than we thought
2.4-Million-Year-Old Stone Tools Found in Algeria - The Atlantic
Human ancestors left Africa 2.1 million years ago journeying to Asia
Tools from China are Oldest Hint of Human Lineage Outside Africa - Scientific American
Homo erectus - Wikipedia
These are the Decade's Biggest Discoveries in Human Evolution, Smithsonian Voices
Archaeologists in China Discover the Oldest Stone Tools Outside Africa - The New York Times