Measuring just 2.9 inches (7.3 centimeters) long, the tool looks a bit like a small prehistoric Swiss Army knife. The sharp-edged flint blade was fastened to a wooden handle with birch tar ...

this Swiss army knife is optimized for portability. It weighs just 2.3 ounces and measures just 3.6 inches long, so it’s easy to stash in a pocket or attach to your keys. Despite its small size ...