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Determining the age through ribs and teeth

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For scientists, the best method for narrowing down a person's age is a combination of five weighted factors known as the Complex Method. It includes analysis of the pubic bones that lie just under the navel along with some vertebral bones, both sets of which start out rough in youngsters but smooth out over time; images of the femur, or thigh bone, which becomes thinner and loses bone mineral over time; dental wear; and closure of the cranium.
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"My wife's love is what unites Krypton and Earth in my heart. Without it, without her, I truly would be in hell."

~ Superman: Man of Tomorrow #15