@CNN: 2,000 years ago, people watched as animals mysteriously died at the entrance to a grotto in modern-day Turkey that was purported to be a gateway to the underworld. 2,000 years later, scientific research reveals the reason https://t.co/QOZhQZ5snn https://t.co/bZ3ePQJiE0
2,000 years ago, people watched as animals mysteriously died at the entrance to a grotto in modern-day Turkey that was purported to be a gateway to the underworld. 2,000 years later, scientific research reveals the reason https://t.co/QOZhQZ5snn pic.twitter.com/bZ3ePQJiE0
— CNN (@CNN) March 10, 2018