DNA and the spread of domesticated horses; gold shunned in the Caucasus; cosmic radiation helps date Viking site in Newfoundland; foragers in Madagascar altered the landscape

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Study of horse DNA provides new evidence about the spread of the Indo-European languages

Ancient Caucasians may have shunned gold for cultural reasons

Cosmic radiation allows researchers to date Viking artifacts in Newfoundland

Evidence from Madagascar shows that foragers make lasting changes to environments they inhabit.