Lab experiments have shed light on an enduring question about humanity's relationship with tools. Measurements at Lamont-Doherty Earth Observatory's Paleomagnetics Lab outside New York City show that our ancestors had an impressive tool chest at least 1.76 million years ago, 300,000 years earlier than previously thought. The researchers were able to determine the date of sophisticated hand axes and other cutting tools found in Kenya by examining surrounding mudstone that preserved the direction of Earth's magnetic field. Because this field shifts periodically, paleontologists can analyze this record to fix the age of the sediments from which the tools were quarried. It proves that Homo erectus, a precursor to modern humans that died out 70,000 years ago, used axes with chiseled edges to butcher and maybe hunt large animals like elephants.
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