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[Music] in 1946 chemist Willard Libby proposed a new way to scientifically estimate how old a dead thing is by measuring the amount of radioactive carbon left in it weve used this method to date a bunch of stuff from the wood of an Egyptian pharaohs boat to fossilized human poop but carbon dating is only reliable for objects younger than 50 thousand years or so and what if the thing you want to date never had any carbon to begin with what then here are four clever ways scientists figure out how old stuff is carbon dating belongs to a larger group of techniques known as radiometric dating these methods rely on measuring the ratio of abundance of two different atoms sometimes these atoms are two different elements other times its the same element with different numbers of neutrons called isotopes for carbon dating its the ratio of radioactive carbon-14 a carbon with eight neutrons and stable carbon-12 a carbon with six neutrons because the rate at which the radioactive isotope decays
