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For nearly a century, a strange band of 5,200 holes carved into a hillside has defied explanation. Stretching for nearly a mile along the edge of the Pisco Valley, Monte Serpe – "serpent mountain" – may have finally revealed its secrets to scientists.

Researchers found that when groups of people watch the same health promotion videos, their brain activity syncs up, indicating that the message has gone beyond being seen and heard. This approach could lead to more effective health campaigns.