The famous Periodic Table of Elements invented by the Russian chemist Mendeleev has just been changed by the IUPAC (International Union of Pure and Applied Chemistry).
They discovered that the atomic weights of ten chemical elements were not a constant and a fixed number, but a value out of an interval.
That's interesting not just for chemistry itself, but also in the world of sport. Why? Because it is important, in sports doping investigation, to distinguish human testosterone from the pharmaceutical one. The atomic weight of carbon into the latter is lower, so, the precision of the analysis could be crucial in the eternal fight between sport and these consequences of a champion-based model.
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