text: Just like these 7 letters are the most frequent letters in English texts, entangled states and linear operators are virtually omnipresent in quantum mechanics and anything and everything linked to it. If you haven't learned E,T,A,I,N,O,S, then you are illiterate. If you feel uncertain about the existence of entanglement or linearity of all operators, you are illiterate in quantum mechanics. If you are waiting for a kettle or for Sherlock Holmes to reduce E,T,A,I,N,O,S or entanglement or linearity of operators to something that you already know, e.g. how to make poops, then you are a baby who has a long way to go before you learn the basic things. This conclusion is addressed to Mr Deutsch and Ms Marletto, too. She is attractive and he is... sorry, I can't think of a positive adjective now..., but they are totally deluded about modern physics.