No one can predict the moment when a particular grain will fall through the neck, but an estimate can be made for how long the whole pile of sand will take to fall.A similar process takes place with the radioactive decay of atoms.Though most atoms contain stable nuclei and do not decay, some types do.
Radiometric dating can be compared to an hourglass.When the timepiece is turned over, sand grains fall from the top of the hourglass to the bottom.
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