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But they do not even mention the basic problem that you cannot know the radioactive concentrations that existed in the rock in the past.In other words, the fatal problem with all radioactive dates is that they are all based on assumptions about the past.“This is the first relatively complete mammoth carcass – that is, a body with soft tissues preserved – to show evidence of human association,” Daniel Fisher, curator and director of the University of Michigan’s Museum of Paleontology, told Discovery News.Fisher explained that the settlers removed “parts include most of the main core mass of Yuka's body, including organs, vertebrae, ribs, associated musculature, and some of the meat from upper parts of the legs,” but the rest remained intact.When I have asked an audience this question they have looked at me incredulously and said, “Starting time?” You cannot know how long the swimmer took unless you knew the time on the wristwatch when the race started.

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Without these observations you cannot be sure that the time is valid.

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.

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.

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