There is no sharp dividing line between the foundations of physics and
philosophy of physics. This is especially true for quantum mechanics.
The debate on the interpretation of quantum mechanics has raged in both
the scientific and philosophical communities since the 1920s and
continues to this day. (We shall understand the unqualified term
'quantum mechanics' to mean the mathematical formalism, i. e. laws and
rules by which empirical predictions and theoretical advances are made.
) There is a popular rendering of quantum mechanics which has been
publicly endorsed by some well known physicists which says that quantum
mechanics is not only 1 more weird than we imagine but is weirder than
we can imagine. Although it is readily granted that quantum mechanics
has produced some strange and counter-intuitive results, the case will
be presented in this book that quantum mechanics is not as weird as we
might have been led to believe! The prevailing theory of quantum
mechanics is called Orthodox Quantum Theory (also known as the
Copenhagen Interpretation). Orthodox Quantum Theory endows a special
status on measurement processes by requiring an intervention of an
observer or an observer's proxy (e. g. a measuring apparatus). The
placement of the observer (or proxy) is somewhat arbitrary which
introduces a degree of subjectivity. Orthodox Quantum Theory only
predicts probabilities for measured values of physical quantities. It is
essentially an instrumental theory, i. e.
