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So while something is living, they'll have a certain amount of carbon-14 in their tissue.But then once they die, they're now no longer adding more carbon-14.But even in the written, you've gotta wonder what's added over each generation.You can imagine people embellishing, making the story a little bit better.And the carbon-14 decays into the more stable carbon-12.And so based on the ratio between the carbon-14 to the carbon-12, and it takes roughly 5,000 years, 5,730 years to be exact, for roughly half of the carbon-14 to decay into carbon-12.Just to put it in perspective, if this is present time, if you wanted to put, when was the Roman Empire?

But even once you have a sense of what they say or even if you understand it quite well, you still have to do a lot of detective work and take everything with a grain of salt.

You also have to be skeptical because you don't know whether these stories are actual accounts or whether someone just made it up to fit a worldview.

You also have to keep in mind that these stories, whether they were transmitted written or orally, they're oftentimes retransmitted from generation to generation, and especially in the oral case.

- [Instructor] Anatomically modern human beings have been on this planet for roughly 200,000 years.

And even though that's a small fraction of the amount of time the Earth has been around, which is over 4 billion years, on a human scale it's an incredibly long amount of time.

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