This paper makes three points: Entropy is real. Entropy is a good measure of how small quantum objects are. Entropy increase and the Born rule happen together.Entropy was shown to be real before atoms were shown to be real. Yet many people persist in believing that entropy is an illusion. One reason is: in classical mechanics, entropy must be an illusion. Boltzmann showed how to create and measure the illusion of entropy. Poincare and others showed that it was an illusion.In quantum mechanics entropy can be real. The quantum representation of an object is a probability distribution over wavefunctions (a density matrix NOT A WAVEFUNCTION). There is no reason that the probabilities are any less real than other reality.Entropy is a dimension in which a quantum object must be small. Only objects with zero entropy have a wavefunction. Another way to ask how small are quantum objects? is how small must objects be to exhibit amplitude interference? For interference ((Signal + Noise) / Signal) is exponential in entropy, measured in natural units. Thus the natural unit of entropy provides a scale of how small quantum objects are.Introducing the "Entropy Is Real" (EIR) interpretation of quantum mechanics. Whenever entropy can increase, the probability (or rate) that a given path is taken to increase entropy is given by the appropriate Born Rule (not time reversible). Only with the residual probability, the density matrix propagates by the appropriate time reversible (Hamiltonian) (Unitary) operator.It is time to retire the idea that entropy is an illusion.Yet many people persist in believing that entropy is an illusion.