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Traditionally researchers built timelines of human prehistory based on fossils and artifacts, which can be directly dated with methods such as radiocarbon dating and Potassium-argon dating.

However, these methods require ancient remains to have certain elements or preservation conditions, and that is not always the case.

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These changes accrue like the ticks on a stopwatch, providing a “molecular clock.” By comparing DNA sequences, geneticists can not only reconstruct relationships between different populations or species but also infer evolutionary history over deep timescales. This is an informational tour in which students gain a basic understanding of geologic time, the evidence for events in Earth’s history, relative and absolute dating techniques, and the significance of the Geologic Time Scale.A fair look at the evidence shows that humans are optimized for eating mostly or exclusively plant foods, according to the best evidence: our bodies.We're most similar to other plant-eaters, and drastically different from carnivores and true omnivores.Those who insist that humans are omnivores, especially if their argument is based on canine teeth, would do well to look at what the evidence actually shows. I first wrote this article many years ago, but since then Milton Mills, M. published an excellent paper which covers the anatomy of eating, so let's skip right to my table-ized summary of his research: The meat-eating reader already has half a dozen objections to this before s/he's even read the rest of the article, and I will address those objections specifically, but first let me address them generally: It's human nature to want to feel that what we're doing is right, proper, and logical.Over the past six decades, the amount of radiocarbon in people or their remains depends heavily on when they were born or, more precisely, when their tissues were formed.Forensic anthropologists at The University of Arizona took advantage of this fact in a recent study funded by NIJ.When we're confronted with something that suggests that our long-held belief might actually be wrong, it's uncomfortable.We can either consider the new evidence fairly, adding to the discomfort about our possible error, or we can reject that premise without truly considering it, which allows us to sidestep any uncomfortable feelings.Archaeologists have long used carbon-14 dating (also known as radiocarbon dating) to estimate the age of certain objects.Traditional radiocarbon dating is applied to organic remains between 500 and 50,000 years old and exploits the fact that trace amounts of radioactive carbon are found in the natural environment.

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