Modern scientific research has identified the major physiological, neurological, and genetic differences between humans and our biological ancestors. In particular, it has been found that the human brain is qualitatively different in terms of the development of the parts of the brain that control abstract reasoning, social behaviour, and manual abilities. This discovery is yet more evidence in favour of the explanation that Frederick Engels gave for the evolution of humans in his essay “The Part Played by Labour in the Transition from Ape to Man”.