A research team reports new findings of stone age tools that suggest humans came "out of Africa" by land earlier than has been thought.

Geneticists estimate that migration from Africa to South-East Asia and Australia took place as recently as 60,000 years ago.

But Dr Michael Petraglia, of Oxford University, and colleagues say stone artefacts found in the Arabian Peninsula and India point to an exodus starting about 70,000 to 80,000 years ago - and perhaps even earlier.

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In particular, some tools were sandwiched in ash from the famous Toba eruption that geologists can date very accurately to 74,000 years ago.

Read more here: http://www.bbc.co.uk/news/science-environment-11327442