Happy World Quantum Day!
This year (2025) also marks the International Year of Quantum, highlighting 100 years since the inception of the development of quantum mechanics: the centenary of the foundation of Matrix Mechanics ('Dreimännerarbeit' by Werner Heisenberg, Max Born, and Pascual Jordan), which provided the first mathematically consistent and rigorous formalism framework that replaced the old quantum theory models initially pioneered by Max Planck (followed by Albert Einstein, Niels Bohr, etc.), until Wave Mechanics (by Erwin Schrödinger and later by Paul Dirac) acquired recognition for its intuitive nature.