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A twin of the heart without atria and ventricles and vessels. An in-silico copy of the most fundamental of human organs to understand how cardiovascular diseases evolve, whether valves or pacemakers do things well, and above all that is capable of working on large numbers of patients, all virtual, taking into account the statistical variability . It would be a great advantage for cardiology research, a heart like this: a digital twin that simulates large clinical trials without involving real people, patients in the flesh.