Drier, less predictable environment may have spurred human evolution

• Evidence of a variable but progressively drying climate coincides with a major shift in stone-tool-making abilities and the appearance of modern Homo sapiens.
•  Sediment cores obtained by the Hominin Sites and Paleolakes Drilling Project provide the first continuous environmental context for the diverse archeological evidence recovered from nearby localities in the East African rift valley.
• scientists have attempted to piece together the complex puzzle that is the history of our human origins, including the environmental context of that history.

SOURCE : SCIENCE DAILY