Stone legacy of skilled hands

Article Abstract:

A newly discovered, smaller brained, stone-using hominid, dated to 1.8 million years old (Myr) was added to the genus Homo, in 1964, named Homo habilis. The work was later complicated when the Oldowan tool kit was shown to be less organized than originally thought. Roche and colleagues' findings from Lokalalei, an archaeological site, show a good command of basic fracture mechanics. Marzke and colleagues have identified hand muscles essential in the experimental manufacture of Oldowan tools, using electromyography.

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Modern human origins backdated

Article Abstract:

Datings of a homonid cranium and femur from Kenya's Lake Turkana region indicate a need for the modification of the chronological framework of Homo sapiens evolution in Africa. The datings belie earlier assumptions concerning early and late archaic Homo sapiens as well as the earliest modern humans, as they appear to have existed significantly earlier. They also indicate ages of about 270,000 and 300,000 years, respectively, making them the world's oldest near-modern human specimen.

Human evolution, Chronology, Archaeological dating

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