A Cosmic Airburst May Have Devastated a Vast Native American Culture 1,500 Years Ago

More than 1500 years ago, a vast culture known as the Hopewell tradition (or Hopewell culture) stretched across what is today the eastern United States. 
The cause of the culture’s decline has long been debated, with war and climate change two of the …More than 1500 years ago, a vast culture known as the Hopewell tradition (or Hopewell culture) stretched across what is today the eastern United States. 
The cause of the culture’s decline has long been debated, with war and climate change two of the …