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Well, it's about measuring radioactive decay in the oldest rock we found, right? I wonder if that means that it is rock that have wandered upwards from the inner of Earth in tectonic upheavals, if so can we define them to some depth? Read about using atomic devices for taking 'pictures' of Earths inner. The Russians, who loved the idea of using atomic weapons as their new digging tool, did some remarkable surveys in the proceedings of that as I understood. I feel sorry for those living in those areas today btw. Makes me wonder how long we will allow id** and arse lickers to be the ones deciding a civilizations direction? Because, we're all belonging on one small world, and we're all one civilization, the human one.