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Here are the three major assumptions for your consideration: Are these foundational assumptions reasonable?
Recent findings seem to indicate that though we ourselves have not been able to vary the decay rates by much in the laboratory, the decay rates may have been accelerated in the unobservable past .
An isotope is one of two or more atoms which have the same number of protons in their nuclei, but a different number of neutrons.
Radioisotopes are unstable isotopes: they spontaneously decay (emitting radiation in the process -- thus making them radioactive).
That is why you need at least two, sometimes three judges to measure the time of the race to the standard needed to enter the record books.
It would make no difference how accurate or high-tech the wristwatch was.
This belief is based upon three significant assumptions.
A swimming race illustrates the simple principles involved in measuring time.
This swimmer is competing in a 1,500 metre race and we have an accurate, calibrated wristwatch.
If this were the case, the first assumption would be deemed unreasonable.
This would completely upset our current standardized view of earth's history.
The Uranium-238 radioisotope goes through 13 transitional stages before stabilizing into Lead-206 (U238 Pb206).