linguistic:paraphrasing, structural:summarization, quality:corruption
Variation and evolution

From early primates to hominids and finally to Homo sapiens, the brain is progressively larger, with exception of extinct Neanderthals whose brain size exceeded modern Homo sapiens. The volume of the human brain has increased as humans have evolved (see Homininae), starting from about 600 cm in Homo habilis up to 1680 cm in Homo neanderthalensis, which was the hominid with the biggest brain size. Some data suggest that the average brain size has decreased since then, including a study concluding the decrease "was surprisingly recent, occurring in the last 3,000 years". However, a reanalysis of the same data suggests that brain size has not decreased, and that the conclusion was made using datasets that are too dissimilar to support quantitative comparison.