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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.

At high geomagnetic latitudes, the carbon-14 spreads evenly throughout the atmosphere and reacts with oxygen to form carbon dioxide.

Carbon dioxide also permeates the oceans, dissolving in the water.

And you have to check to make sure he touches the edge at the end of each lap.

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

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the 14 biological objects from archaeological excavations of the tram line 2, with particle accelerators, AMS method, including the bone material, burnt or not, with or without extraction of collagen.

Libby calculated the half-life of carbon-14 as 5568, a figure now known as the Libby half-life.

Following a conference at the University of Cambridge in 1962, a more accurate figure of 5730 years was agreed upon and this figure is now known as the Cambridge half-life.

Without the starting time it is Actually, knowing the starting time is still not enough.

During the race you have to watch the swimmer and count how many laps he has swum so you know that he has done 1,500 metres.

A swimming race illustrates the simple principles involved in measuring time.