Archaeologists working in eastern Jordan have announced the discovery of 20,000-year-old hut structures, the earliest yet found in the Kingdom. The finding suggests that the area was once intensively occupied and that the origins of architecture in the region date back twenty millennia, before the emergence of agriculture.
The research, published 15 February, 2012 in PLoS One by a joint British, Danish, American and Jordanian team, describes huts that hunter-gatherers used as long-term residences and suggests that many behaviours that have been associated with later cultures and communities, such as a growing attachment to a location and a far-reaching social network, existed up to 10,000 years earlier.
Excavations at the site of Kharaneh IV are providing archaeologists with a new perspective on how humans lived 20,000 years ago. Read more.
The Romans started making concrete more than 2,000 years ago, but it wasn’t quite like today’s concrete. They had a different formula, which resulted in a substance that was not as strong as the modern product. Yet structures like the Pantheon and the Colosseum have survived for centuries, often with little to no maintenance. Geologists, archaeologists and engineers are studying the properties of ancient Roman concrete to solve the mystery of its longevity.
“Roman concrete is … considerably weaker than modern concretes. It’s approximately ten times weaker,” says Renato Perucchio, a mechanical engineer at the University of Rochester in New York. “What this material is assumed to have is phenomenal resistance over time.”
That resistance, or durability against the elements, may be due to one of the concrete’s key ingredients: volcanic ash. Read more.