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The result: alternating layers under the lake bottom that make it easy to identify every year, one after the other, going well back into the last Ice Age.Armed with this perfect record, the scientists then performed radiocarbon dating on the plant residues from a subset of the layers.However, one of the most familiar of these timelines, known as radiocarbon dating, just got a lot more precise.According to a paper published in the journal Science, measurements from the bottom of Japan’s Lake Suigetsu have allowed scientists to improve the technique dramatically.Older, and the lake's sediments don't go back that far.This impressive achievement comes thanks to Lake Suigetsu’s calm waters, and also from the lucky fact that the plant matter that drifts into the water and sinks to the bottom is light-colored in winter and dark in summer.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.

Radioactive decay results from unstable combinations of protons and neutrons in the atom’s nucleus.

Now, thanks to those lake sediments, scientists can narrow that range down to just 10 years or less -- but only if the sample is between 11,000 and 53,000 years old.

Younger and there hasn't been enough breakdown in the radioactive carbon.

This information can be used to find the year that the watch was made.

Use a flat blunt blade to pry open the snap case back of a Waltham wrist watch.

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