Supersymmetry, born in the early 1970s, is a very rich theory which is supposed to describe the widest range of natural phenomena. Although it has not yet been discovered experimentally, it proved to be a powerful tool in Quantum Chromodynamics (QCD) -- the theory of hadrons -- and strongly coupled gauge theories at large. Efforts aimed at solving various aspects of QCD basing on supersymmetry and string-inspired ideas bring fruits. In a remarkable entanglement, theoretical constructions of the 1970s and 1990s combine with today's ideas to provide new insights and a deeper understanding.
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