For 100 years, almost all physicists have believed that it was no longer possible to understand the true constitution of nature. The culprit is the unsolved wave-particle paradox, the apparent contradiction between wholeness & divisibility - that subtle smile of nature that was so perplexing that theoretical physics threw in the towel in despair as early as 1927. This was a direct consequence of the Copenhagen Interpretation, in which Niels Bohr had postulated an insurmountable barrier of cognition (at least for physicists). Since then, nature has been regarded as bizarre and weird, the quantum puzzle as unsolvable, and the theory as so complicated that it can no longer be understood by ordinary mortals. In reality, however, the underlying experiments are of a poignant simplicity that even laymen can easily understand geometrically: they show holistic division and branching processes and thus refute the atom and elementary particle hypothesis, i.e. the atomstic world view. Volume 1 introduces the quantum puzzle and identifies the four cognitive problems of quantum physics. They are obviously caused by assumptions that are considered proven, but must nevertheless be false. So we embark on a detective search for clues in the history of ideas in 19th century physics. The investigation reveals, among other things, that the indivisibility hypothesis already failed experimentally justified in the founding days of chemistry, which led Avogadro to the hypothesis of divisible 'atoms', called molecules. The mechanistic interpretation of this divisibility then led to the salvation of the atomic hypothesis, which, however, around 1927 - in quantum physics - suddenly proved to be untenable. No physicist could make sense of it, which led to a hundred-year blockade of thought in theoretical physics: the atom hypothesis had become a paradigm that apparently could no longer be reasonably questioned...