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Whether the quantum mechanics (QM) is non-local is an issue disputed for along time. The violation of the Bell-type inequalities was considered asproving this non-locality. However, these inequalities are constructed on aclass of local hidden variables, which obey the calculus with positiveprobabilities. Such a calculus is rather suitable for billiard balls while theQM deals with wave-packets of complex amplitudes. There is no wonder that acalculus with positive numbers does not match a calculus with complex numbers.The present text describes a different model of hidden variables forentanglements, model that reproduces the quantum predictions in differentexperiments, and also explains why the QM is nonlocal. The model deals withwaves, some of them full and the others empty, and the hidden variables markwhich waves are full. The basic physical concept with which the model operatesis joint amplitudes of probability, and not probabilities. The latter are asecondary concept, the probability of a combination of results being equal tothe absolute square of sum of all the contributing joint amplitudes. Thus thenon-locality appears: a) a joint amplitude ignores distance, it handles distantparticles as if they were one single particle at one single place, b) jointamplitudes are complex numbers and the sum of several contributions may vanish,blocking the respective combination of wave-packets and therefore of results.Although showing the success of the model, this text does not advocate forfull/empty waves. It is shown that this hypothesis works only as long as onedoes not consider moving observers, and does not compare their conclusions. Thereal purpose here is to point to a severe impasse: assuming the existence of apreferred frame contradicts the theory of relativity, while refuting thefull/empty waves idea one runs into other insurmountable difficulties.

A problem with Bell-type Inequalities, the origin of the quantum non-locality, and a full/empty waves model for entanglements