"Logic, which can only give certainties, is the instrument of demonstration; intuition is that of invention." - Henri Poincaré (La Valeur de la Science, 1905)

Conjecture

"Feynman, I know why all electrons have the same charge and the same mass [...] Because, they are all the same electron!" - John Archibald Wheeler (Richard P. Feynman, 1965)

"Nature is as it is because this is the only possible nature consistent with itself," - Geoffrey Chew (Physicists Uncover Geometric 'Theory Space', Quanta Magazine, 23 February 2017)

What is the difference between a particle with infinitesimal mass occupying infinite space and a particle with infinite mass occupying infinitesimal space?