One flight over the quantum chromodynamics. Part Two: Quantum Mechanics

This is the second of a series of popular lectures on quantum chromodynamics. The first (introductory) lecture can be found here: https://scfh.ru/blogs/O_fizike_i_fizikah/polet-nad-kvantovoy-khromodinamikoy/ The lecture deals with the one of the main pillars of quantum chromodynamics --- quantum mechanics . Non-physicists usually consider quantum mechanics as an extremely weird subject far from the everyday common sense. Partly this is true. However we will try to argue in this lecture that in its essence quantum mechanics is, in a some sense, even more natural than classical mechanics, and it is not so far from the common sense as a layman usually assumes.