Briefing Chat: The epic journey of Stonehenge’s central stone

In this episode:

00:37 Evidence that Stonehenge's Altar Stone travelled by glacier

BBC Science Focus: We may have just cracked one of Stonehenge's greatest mysteries

05:44 Fossilized faeces reveal DNA from ancient ecosystem

Nature: Ancient ground squirrels feasted on carcasses like ‘zombies of the Pleistocene’

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