Re-creating old weapons for new discoveries of human history

Metin Eren wasn't satisfied just digging up ancient arrowheads to learn about the past. He wanted to use them for their intended purpose.

In this June 1, 2017, photo, Metin Eren, an archaeologist at Kent State University, looks at a newly chipped flake of 
obsidian in Kent, Ohio. Eren runs a newly-opened laboratory which makes replicas of ancient arrows, knives, 
and pottery to be shot, crushed, and smashed. It's allowing researchers to learn about engineering techniques 
of the first native Americans without destroying priceless genuine relics in the process 
[Credit: AP/Dake Kang]

But shooting and shattering priceless millennia-old tips is out of the question, so instead, the archaeologist chips replicas of the stone-age weapons by hand.

"We can break 'em and throw 'em," he says. "Our imagination is the limit."

The 34-year-old Kent State University professor specializes in experimental archaeology — re-creating ancient pots, knives and arrows. By testing the replicas in ways impossible with the originals, archaeologists study how tools found in archaeological digs were actually used.

"The stuff that we find, it's just stuff," says Brian Andrews, an archaeologist at Rogers State University. "Stuff's cool, but we're not interested in stuff for the sake of itself. We're interested in the human behaviors that went into making it."

In this June 1, 2017, photo, Metin Eren, an archaeologist at Kent State University, flakes obsidian in Kent, Ohio. Eren runs
 a newly-opened laboratory which makes replicas of ancient arrows, knives, and pottery to be shot, crushed, and smashed.
 It's allowing researchers to learn about engineering techniques of the first native Americans without destroying 
priceless genuine relics in the process [Credit: AP/Dake Kang]

Eren's experiments focus on making sense of ancient weapons littered across the Americas, illustrating how humans first settled the Western Hemisphere: through careful preparation, long-term planning, and refined technology.

"Even though it's the Stone Age, they're still thinking in a very modern way," Eren says.

Already he has cracked one longtime mystery. In the early 1900s, archaeologists found unusually shaped arrowheads in North America, with grooves carved from the base halfway to the head's tip. They first appeared over 13,000 years ago and spread rapidly across the continent, but existed nowhere else. Researchers were puzzled why the grooves were carved, with speculation running from religious rituals to mere decoration.

That's where experimental archaeology came in. By testing the pressure at which the arrowheads would crack using a $30,000 crusher and computer models, Eren discovered the grooves act as a shock absorber. It allows the arrowhead's thinned base to crumple slightly and absorb energy upon the arrow's impact, making the head less likely to break.

In this June 1, 2017, photo, Michelle Bebber, a PhD archaeology student at Kent State University, loads a bow with a 
recreated ancient arrow in Kent, Ohio. Bebber conducts research at a newly-opened laboratory which makes replicas 
of ancient arrows, knives, and pottery to be shot, crushed, and smashed. It's allowing researchers to learn about 
engineering techniques of the first native Americans without destroying priceless genuine relics in the process 
[Credit: AP/Dake Kang]

Archaeologists call it the "first truly American invention."

Scientists from Brazil to Britain previously conducted many kinds of experiments with re-creations, and borrowing techniques and technologies from other scientists has been long-standing practice.

Still, Eren's lab, only a year old, stands out for its cutting-edge equipment and singular focus on archaeological experimentation, says Briggs Buchanan, a professor at the University of Tulsa.

"Metin's lab is setting an exceptional example by conducting rigorous controlled experiments," said Buchanan, who has co-authored papers with Eren. "Earlier experimental studies suffered from being of variable quality and rarely built on previous studies."