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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co.
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Although fission tracks are are too small to see with even the most sensitive microscopes, they can easily be revealed by acid etching.
An age can be calculated by (a) counting the surface density (in tracks per unit area) of the fission tracks with an optical microscope, (b) mathematically converting this surface density to a volume density (tracks per unit volume), and (c) measuring the U-content (atoms per unit volume) of the same surface.
Taking fission track dating to a proverbial `county fair' of citizen-scientists benefits the method in three ways: (a) Results of Galton (1907)'s ox-weighing experiments, and (b) the 1984 fission track calibration study.
In both cases, the (geometric) mean of multiple estimates is far more accurate than any individual estimate.