Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.
There are over forty such techniques, each using a different radioactive element or a different way of measuring them.
In a closed or semi-open adoption, there may be no way for an adopted child to ask questions or clarify vague or missing information that may only become relevant long after the adoption occurred.The former soldier, who apologised at sentencing for his crimes, said he wasn't seeking sympathy nor trying to justify his actions - killings prosecutors described at trial in 2009 as one of the worst crimes of the Iraq war.Prosecutors sought a death sentence, but a federal jury in Paducah, Kentucky, opted for five life sentences on charges including the rape and murder of 14-year-old Abeer Qassim Al-Janabi and the shooting deaths of her mother, father and younger sister.'There's not a word that would describe how much I hated these people,' Green said.'I wasn't thinking these people were humans.'Over the next four months, Green sought help from a military stress counsellor, obtaining small doses of a mood-regulating drug - and a directive to get some sleep before returning to his checkpoint south of Baghdad.