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The team members found that some of the bones and teeth bore a characteristic breakage pattern known as spiral fracturing, considered to occur when the bone is fresh.

Additionally, some of the bones showed characteristic signs of being smashed with hard objects.

A study that claims humans reached the Americas 130,000 years ago – much earlier than previously suggested – has run into controversy.

The conclusions rest on analysis of animal bones and tools from California.

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A study that claims humans reached the Americas 130,000 years ago – much earlier than has previously been suggested – has run into controversy.

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The phenomenon of radiohalos has been known to geologists since the early part of the 20th century, but wider interest has been prompted by the claims of creationist Robert V.

Gentry that radiohalos in biotite are evidence for a young earth (Gentry 1992).

Radiohalos or pleochroic halos are microscopic, spherical shells of discolouration within minerals such as biotite that occur in granite and other igneous rocks.

The shells are zones of radiation damage caused by the inclusion of minute radioactive crystals within the host crystal structure.

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