Rethinking Humanity: Ape-Sized Brain Challenges Theories.

The discovery of a small-brained hominin species in South Africa is challenging the long-held belief that brain size was the key factor in the evolution of humans. The species, named Homo naledi, had a brain the size of an ape but walked upright and used tools, suggesting that other factors, such as social behavior, may have played a larger role in human evolution than previously thought.