The researchers, led by Mateja Hajdinjak at the Max Planck Institute for Evolutionary Anthropology, extracted tiny amounts of bone or tooth powder—sometimes as little as 9mg—and used a chemical process to remove modern genetic contamination. They also checked for the telltale signs of degradation found in ancient DNA.
Source: arstechnica.com
Last spring, the geobiologist Dominic Papineau and colleagues reported that fossilised microorganisms were identified in 3.77-4.28-billion-year-old iron-rich rock in Quebec: hematite tubes and filaments whose appearance is similar to microorganisms that today live in hydrothermal vents. Others dismissed their findings as ‘dubiofossils’, a term the geologist Hans Hofmann coined in 1972 to describe controversial fossils. ‘Fossils,’ Hofmann wrote, were proven biological; ‘pseudofossils’ resembled life but were inorganic; ‘dubiofossils’ (also known as Problematica or Miscellanea) were equivocal.
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For at least 2.6 million years, humans and our ancestors have been making stone tools by chipping off flakes of material to produce sharp edges. We think of stone tools as very rudimentary technology, but producing a usable tool without wasting a lot of stone takes skill and knowledge. That’s why archaeologists tend to use the complexity of stone tools as a way to measure the cognitive skills of early humans and the complexity of their cultures and social interactions.
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