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Some [skeptics] make it sound like there is a lot of disagreement, but this is not the case.

The disagreement in values needed to support the position of young-Earth proponents would require differences in age measured by orders of magnitude (e.g., factors of 10,000, 100,000, a million, or more).

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Whenever possible we design an age study to take advantage of other ways of checking the reliability of the age measurements.

The simplest means is to repeat the analytical measurements in order to check for laboratory errors.

A recent survey of the rubidium-strontium method found only about 30 cases, out of tens of thousands of published results, where a date determined using the proper procedures was subsequently found to be in error.

One question that sometimes arises here is how can scientists assume that rates of radioactivity have been constant over the great time spans involved.

Such failures may be due to laboratory errors (mistakes happen), unrecognized geologic factors (nature sometimes fools us), or misapplication of the techniques (no one is perfect).