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This is an article written in a popular science style, in which I willexplain: (1) the famous Heisenberg uncertainty principle, expressing theexperimental incompatibility of certain properties of micro-physical entities;(2) the Compton effect, describing the interaction of an electromagnetic wavewith a particle; (3) the reasons of Bohr's complementarity principle, whichwill be understood as a principle of incompatibility; (4) the Einstein,Podolski and Rosen reality (or existence) criterion, and its subsequentrevisitation by Piron and Aerts; (4) the mysterious non-spatiality of thequantum entities of a microscopic nature, usually referred to as non-locality.This didactical text requires no particular technical knowledge to be read andunderstood, although the reader will have to do her/his part, as conceptuallyspeaking the discussion can become at times a little subtle. The text has beenwritten having in mind one of the objectives of the Center Leo Apostel forInterdisciplinary Studies (CLEA): that of a broad dissemination of scientificknowledge. However, as it also presents notions that are not generallywell-known, or well-understood, among professional physicists, its reading mayalso be beneficial to them.

Heisenberg uncertainty principle and the strange physics of spaghetti