Aug 31, 2024
Mysterious ancient earthworks called Geoglyphs, in Rio Branco, Acre, Brazil. (Larger).
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Mysterious ancient earthworks called Geoglyphs, in Rio Branco, Acre, Brazil. (Larger).
Ancient Native Americans were among the world's first coppersmiths
About 8500 years ago, hunter-gatherers living beside Eagle Lake in Wisconsin hammered out a conical, 10-centimeter-long projectile point made of pure copper. The finely crafted point, used to hunt big game, highlights a New World technological triumph—and a puzzle. A new study of that artifact and other traces of prehistoric mining concludes that what is known as the Old Copper Culture emerged, then mysteriously faded, far earlier than once thought.
The dates show that early Native Americans were among the first people in the world to mine metal and fashion it into tools. They also suggest a regional climate shift might help explain why, after thousands of years, the pioneering metallurgists abruptly stopped making most copper tools and largely returned to stone and bone implements.
Earth's largest and purest copper deposits are found around North America's Great Lakes. At some point, Native Americans learned to harvest the ore and heat, hammer, and grind it into tools. They left behind thousands of mines and countless copper artifacts, including lethal projectile points, hefty knives and axes, and petite fish hooks and awls. Today, it's not uncommon to meet residents of the region "who have buckets of copper artifacts [that they've found] tucked away in their basements," says David Pompeani, a geologist at Kansas State University, Manhattan, who studies ancient mining.
Laser mapping reveals hidden structures in Amazon
Thousands of ancient geometric earthworks, like this one from Fazenda Paraná, may remain scattered and hidden throughout the Amazon Basin. (Larger).
Science.org article linked here
A nanoengineered immunosensor uses machine learning to detect multiple biomarkers for rapid prediction of acute thrombosis.
Rapid detection of blood clots that form in vessels and obstruct blood flow.
Skydiving salamanders is what the world needs
Skydiving salamanders is what the world needs
Photo by Yuri Meesen on Pexels.com Watch salamanders ‘skydive’ in a wind tunnel For a controlled descent in redwood trees, these salamanders pose like pros
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