Seventy years ago, John Wheeler’s student Hugh Everett wrote a dissertation proposing his theory of the universal wave function, a novel interpretation of quantum mechanics that would eventually evolve into today’s many worlds interpretation.

In 2019, the International System of Units (SI) was redefined. For many, this went by without a hitch -- and that's how it should be.

On this year’s World Quantum Day, IQOQI Vienna once again opens its doors to the public.

We present a bundle geometric formulation of non-relativistic many-particles Quantum Mechanics (QM) where wave functions are seen as a cocyclic tensorial 0-form on configuration space-time seen as a principal bundle.

After reminding why relationality is the paradigmatic physical insight of General Relativistic theories, we discuss the bundle geometry of their field space.